History Creator / FoxEye

Although developing games has been Fox Eye's main forte, the circle has been expanding its output into other mediums, such as releasing artwork on Website/{{Pixiv}} (found [[https://www.pixiv.net/en/users/11426437 here]]), itself. On April 3, 2020, Fox opened up a fanclub on [[https://fantia.jp/fanclubs/34554 Fantia]] (a Japanese alternative to Patreon), so that fans can further support Fox Eye and gain access to exclusive artwork and {{manga}}-styled stories.

Several of Fox Eye's non-event games can be purchased and downloaded from Website/{{DLsite}}, with several of them offering demos beforehand (see [[https://www.dlsite.com/home/circle/profile/=/maker_id/RG08151.html here]]), while other games are instead {{Freeware}} titles that can be downloaded either from the circle's main website or from their own dedicated websites.

** The titular Polon of ''Polon Memories'' is one for Fox Eye as a whole, with other mascots including Takahara-san from her titular ''Let's Practice, Takahara-san'', and Rico from ''Blue Port''. Polon is featured in the header of Fox's [=FC2=] blog page, and was also his Website/{{Twitter}} profile picture for several years before switching to Chie from ''Blue Port J''. However, once Fox Eye's Twitter account was suspended and they migrated to [[Website/{{Pixiv}} Pawoo]], Polon has returned as the circle's avatar for their new social network residence, and their first image post there is new art of Polon, as well. Following the July 18, 2018 update to Fox Eye's main website, Polon would then get two art pieces of herself to be displayed on the site's front page in a timely matter, compared to the single art for the other Fox Eye girls featured there. Indeed, Polon has among the most official artwork of any Fox Eye character, among the strongest affinity for underwater life (which goes well with the developer's [[SignatureStyle overall theme]]), and even has the most interactions with Fox's own AuthorAvatar.

* SignatureStyle: As mentioned above, every Fox Eye game has one or more of the designer's many girls ([[VideoGame/AquaCube and in one case]], [[TheOneGuy a boy]]) explore underwater areas at the high risk of drowning, with an OxygenMeter of some sort to gauge how much time they have left before they drown, with various games giving you different opportunities to temporarily and/or permanently extend the meter's length. This is mainly out of both AuthorAppeal and for inviting in players that have a {{fetish}} for this material, as well. With that said, [[TruthInTelevision there is quite a lot of realistic and]] ''[[DarthWiki/NightmareFuel graphic]]'' [[TruthInTelevision effort put into how this circle portrays drowning]], such as having the heroine [[AlmostOutOfOxygen struggle to cover her mouth and nose, making her swimming look sloppier and/or more frantic]], having her face turn blue from lack of oxygen circulation to the brain, and leveling how hard she gasps for air upon reaching the water's surface (assuming she makes it in time), which can range anywhere from exhaling her breath softly to ''painfully coughing up water from her lungs''. Due to the VideoGameCrueltyPotential of these factors, and the {{Ecchi}} content the circle has in general, this has the side-effect of making all of Fox Eye's games appear to be fully-fledged [[HGame H-Games]], and playthroughs of these games are often grouped alongside much more blatantly-explicit H-Games by content creators on Website/YouTube and Website/NicoNicoDouga (in reality, only the circle's "[[HotterAndSexier ABYSS]]" games are intentionally closer to being this way).

* {{Retraux}}: Counting all of Fox Eye's games in the list above, Fox has started developing games since UsefulNotes/TheSeventhGenerationOfConsoleVideoGames up to the [[UsefulNotes/TheNinthGenerationOfConsoleVideoGames ninth]]. However, several of them were intentionally developed as if they were made during either the [[UsefulNotes/The16bitEraOfConsoleVideoGames fourth]] or [[UsefulNotes/TheFifthGenerationOfConsoleVideoGames fifth]] generation. For some examples:
** ''Holdover'' looks like a game that one could find on the UsefulNotes/{{MSX}}, while also resembling a classic ''Franchise/{{Metroid}}'' game, being a {{Metroidvania}} and all.
** The first ''Sufferer'' game's was intentionally designed to be an 8-bit ActionRPG experience, to the point that Fox made his own chiptune music for the game. The tabs on this game's Japanese and English websites are even spot-on recreations of the designs of [[UsefulNotes/NintendoEntertainmentSystem Famicom and NES controllers]], respectively (minus the buttons and their labels). However, its graphics (Yuna's [[GraphicsInducedSuperDeformed sprites]], in particular) more closely resemble 16-bit graphics of what can be seen in games like ''VideoGame/TheLegendOfZeldaALinkToThePast'' and ''Franchise/FinalFantasy''[='=]s UsefulNotes/SuperNintendo games (''[[VideoGame/FinalFantasyIV IV]]'', ''[[VideoGame/FinalFantasyV V]]'', and ''[[VideoGame/FinalFantasyVI VI]]'').
** ''Water Leaves''[='=] low-poly graphics are intended to invoke the nostalgic look of Japanese-developed UsefulNotes/Nintendo64 games.

** Fox really enjoys portraying girls in underwater fantasies and all of the activities they can be put through in them, such as swimming, deep-sea diving, breathholding, and [[TheLastOfTheseIsNotLikeTheOthers drowning]]. This is applied to each and every game in the circle through settings that would allow these different situations to occur, such as featuring deep lakes, aquariums, [[BeachEpisode beaches]], [[PoolScene swimming pools]], [[HotSpringsEpisode hot springs]], [[DownTheDrain underwater caves]], [[UnderwaterRuins flooded ruins]], [[DrowningPit submerged pits]], and/or other such UnderTheSea and DownTheDrain locales. Outside of Fox's games, this is also shown in the standalone artwork, mini-comics, and animations he's made. See OxygenMeter and SignatureStyle below for more details.

* OxygenMeter: The cornerstone of the SignatureStyle for single every game made by this doujin developer, represented by either a shrinking air bubble or a decreasing bar. Each game has it behave differently, such as having it completely separate from a LifeMeter[[note]]''Holdover'', ''The Final Escape'', ''BLUE GUARDIAN: Margaret''[[/note]], to draining health after the Oxygen Meter runs out[[note]]''Water Leaves'', ''Mermaid'', ''Sufferer''[[/note]], to basing the Oxygen Meter's {{Cap}} on how much health is left[[note]]''Hades Vanquish''[[/note]], to making it into the game's TimedMission[[note]]''Aqua Cube''[='=]s captured and submerged sibling, ''Barely Breakout![='=]s'' Rescue Puzzles, rescuing an anchored Sandy in ''Underwater Rescue''[[/note]], to having the Oxygen Meter also represent the character's LifeMeter, which means, depending on the game, drowning may be the ''only'' way they can die at all[[note]]''Sacrifice Girl'', the ''Blue Port'' series, ''Let's Practice, Takahara-san!'', ''At Night in a Party'', ''Karin's Skin Diving Diary!'', ''NATICA STAR SPLASH'', ''Lake Bottom Girl''[[/note]]. To play up the AuthorAppeal regarding this mechanic further, most of Fox Eye's games also give their characters [[AlmostOutOfOxygen verbal and/or vocal cues when they're running out of air]], and this is occasionally the only way to know that the character is even drowning at all if the game actually has no visible meter. Some of these same games also have ways to improve how long their protagonists can hold their breath, such as a one-use oxygen recovery item or a permanent oxygen powerup. This mechanic is used somewhat more realistically in these games than in others, as while a character is submerged, their oxygen will drop faster the more they move around, and decrease at a slower pace if they stay still while underwater.

The underwater/drowning theme of this circle owes itself to its main designer's [[AuthorAppeal huge fascination for it]], as Fox [[DoingItForTheArt seeks to portray the beauty of girls in all sorts of safe and dangerous underwater scenarios]], while also building a gathering of fans that share his same thoughts. As such, despite the relatively-clean, all-ages material that can be seen in their previews and their developer's website, most of Fox Eye's games can be seen as NotSafeForWork due to the large drowning focus of the developer giving off {{fetish}} vibes, among other NSFW {{Fanservice}} tropes in certain games such as {{Stripperiffic}} and ClothingDamage. It is not uncommon for some fans to even mistakenly view some of these games as [[HGame H-Games]] due to these factors (however, the circle does have near-genuine examples).

* {{Fanservice}}: Even without counting [[AuthorAppeal the developer's trademark drowning fetish material]], the fact that all of Fox Eye's games share a general theme of UnderTheSea fantasies makes it a good opportunity for most of the their heroines to wear revealing or skin-tight swimwear. Several of the circle's girls [[BuxomIsBetter are pretty well-endowed]], and often also have thick, shapely legs to match their swimming capabilities. Several games also have ClothingDamage in the vein of the ''VideoGame/SenranKagura'' series that eventually leaves the heroine completely naked after taking enough damage. There's usually plenty of artwork of the games' heroines for beating them with or without OneHundredPercentCompletion that tend to be pretty fanservicey, as well. [[spoiler:Some games with art collections are even generous enough to have their guides offer you special inputs and CheatCodes to unlock all of their artwork as an option, so you can view and enjoy the eye candy without having to first earn them by playing the games themselves if you wish.]]

* BuxomIsBetter: The in-game sprites and 3D models tend to [[ZigZaggedTrope zig-zag]] this, with many (though [[VideoGame/BlueGuardianMargaret not]] [[VideoGame/KarinsSkinDivingDiary all]]) of the characters having rather modest chests. The ''artwork'', on the other hand, seems to enjoy giving the heroines moderate to large-sized knockers. The [[BarbieDollAnatomy lack of nipples]] can actually make it more titillating, as it makes the actual breasts more pronounced.

* {{Fanservice}}: Even without counting [[AuthorAppeal the developer's trademark drowning fetish material]], the fact that all of Fox Eye's games share a general theme of UnderTheSea fantasies makes it a good opportunity for most of the their heroines to wear revealing or skin-tight swimwear. Several of the circle's girls [[BuxomIsBetter are pretty well-endowed]], and often also have [[ShesGotLegs thick, shapely legs]] to match their swimming capabilities. Several games also have ClothingDamage in the vein of the ''VideoGame/SenranKagura'' series that eventually leaves the heroine completely naked after taking enough damage. There's usually plenty of artwork of the games' heroines for beating them with or without OneHundredPercentCompletion that tend to be pretty fanservicey, as well. [[spoiler:Some games with art collections are even generous enough to have their guides offer you special inputs and CheatCodes to unlock all of their artwork as an option, so you can view and enjoy the eye candy without having to first earn them by playing the games themselves if you wish.]]

* IllGirl: Heroines that count for this trope tend to suffer from concerningly shorter {{Oxygen Meter}}s.
** Kokono of ''Blue Port J'' has had issues with fainting for years and has no athletic skills compared to her friends, consequently having the lowest breathholding time among that game's 3 heroines.
** Marie of ''Holdover'' had to be preserved and healed from a life-threatening coma for ''at least'' 10 years, weakening her limbs in the process. She then had to be handicapped with [[BlessedWithSuck heavy computer anklets designed to repair her internal organs]], but this also means [[WalkDontSwim she can't swim]] like other Fox Eye heroines can, and has the unfortunate honor of starting out with the weakest breathholding skills ''among Fox Eye's entire character roster''.

* LoadsAndLoadsOfCharacters: Many of Fox Eye's games come with their own casts of characters and protagonists, and there are rare occasions [[{{Crossover}} that said protagonists are drawn together in artwork]]. Some of these protagonists started out in smaller projects, such as single pieces of artwork and animations, [[AscendedExtra before eventually starring in games of their own]].

"Fox Eye" is a DoujinSoft circle that was established in 2008 and lead by a designer who codenames himself "Fox". Their niche is developing underwater fantasy games with a large emphasis on maintaining an OxygenMeter in order to complete their games without letting their (usually female) protagonists drown. Thus, the main focus and challenge of the games is to learn the required timing for when and how to travel underwater, and answering the call to resurface for air. The circle has covered several different VideoGameGenres with the Oxygen Meter [[SignatureStyle as their central and unified mechanic in mind]].

Find Fox Eye's website [[http://www.foxeye.squares.net/ here]] (Japanese).

In 2016, Fox opened up a sister site called "Fox Eye ABYSS", that exclusively covers the developer's [[HotterAndSexier R-15/18+ games]], starting with ''VideoGame/BlueGuardianMargaret''. Find the Fox Eye ABYSS website and the link to their games under that label [[http://www.foxeye.squares.net/abyss/index.htm here]] (Japanese).

Fox previously had a Website/{{Twitter}} account that [[LineToGod you could talk to him in]] and read up on the development of upcoming titles, but after a few years of service, this account [[ScrewedByTheNetwork was suddenly suspended from some potential concerns and riots on Twitter over the more risqué material of the circle]] (most likely the aforementioned drowning material the circle is known for emphasizing). So updates from the circle will now continue on [[Website/{{Pixiv}} Pawoo]], [[https://pawoo.net/web/accounts/730837 here]]. Fox also has an [[http://foxdev.blog17.fc2.com/ FC2 blogspot]], where he will post bigger announcements on his projects and always post download links for his [[TemporaryOnlineContent Christmas Eve-only event games]] (some of which were subsequently brought back permanently as a purchasable CompilationRerelease).

* OurFairiesAreDifferent: ''Barely Breakout! Underwater [=ReMix=]'' has Momoka, an [[FairySexy attractive]] [[YouGottaHaveBlueHair green-haired]] fairy [[YourSizeMayVary that can switch between being small or being human-sized]]. Her wings also turn invisible when she dives underwater. Unlike most fairies, however, [[OxygenMeter she can't breathe underwater]], and as such is one of the three girls that will need to be saved from drowning in the game's [[TimedMission Rescue Puzzles]].

* YouGottaHaveBlueHair: For Fox Eye's DoujinSoft protagonists and allies, Ai from ''Blue Port'', Kassis from ''Water Leaves'', Miyo from ''Sacrifice Girl'', and Medina from ''Mermaid'' all have different shades of blue hair. There are other unusual hair colors from this developer, such as pink[[labelnote:*]]the titular ''Polon'', Moka of ''Blue Port'', Asami of ''Barely Breakout!'', and Rimini of ''Karin's Skin Diving Diary!''[[/labelnote]] and green[[labelnote:*]]Momoka of ''Barely Breakout!''[[/labelnote]]. However, this also gets [[AvertedTrope averted]] as there's still a very healthy showing of natural colors such as brown[[labelnote:*]]Yuu of ''Aqua Cube'', and Yuna of the ''Sufferer'' series[[/labelnote]], dark brunette to black[[labelnote:*]]Honomi, Chie, and Kokono of ''Blue Port J'', Takahara-san of ''Let's Practice, Takahara-san!'', Karin of ''At Night in a Party'' and ''Karin's Skin Diving Diary!'', and the titular Kana of ''In the Aquarium: Sinking With Kana''[[/labelnote]], reddish-brown[[labelnote:*]]Aya of ''Aqua Cube''[[/labelnote]], and ''[[AuthorAppeal especially]]'' [[HairOfGoldHeartOfGold blonde]][[labelnote:*]]Rico of ''Blue Port'', Marie of ''Holdover'', Lorile of ''Water Leaves'', Alice of ''Barely Breakout!'', Erica of ''Mermaid'', Mana and Yurina of ''Hades Vanquish'', the titular ''BLUE GUARDIAN: Margaret'', the titular Natica and Sandy of ''Underwater Rescue'', and Fine, the titular ''Lake Bottom Girl''[[/labelnote]].

* ''[[VideoGame/LakeBottomGirlFineAndTheSunkenStarship Lake Bottom Girl - Fine and the Sunken Starship]]'' (SpiritualSuccessor to the ''Blue Port'' series) (2021-2022) -- AdventureGame

* ''[[VideoGame/LakeBottomGirlFineAndTheSunkenStarship Lake Bottom Girl: Fine and the Sunken Starship]]'' (SpiritualSuccessor to the ''Blue Port'' series) (2021) -- AdventureGame

* ''[[VideoGame/LakeBottomGirlFineAndTheSunkenStarship Lake Bottom Girl: Fine and the Sunken Starship]]'' (2021) -- ActionAdventure

* ''[[VideoGame/LakebedGirlFineAndTheSunkenStarship Lakebed Girl - Fine and the Sunken Starship]]'' (2021) -- ActionAdventure

* OxygenMeter: The cornerstone of the SignatureStyle for single every game made by this doujin developer, represented by either a shrinking air bubble or a decreasing bar. Each game has it behave differently, such as having it completely separate from a LifeMeter[[note]]''Holdover'', ''The Final Escape'', ''BLUE GUARDIAN: Margaret''[[/note]], to draining health after the Oxygen Meter runs out[[note]]''Water Leaves'', ''Mermaid'', ''Sufferer''[[/note]], to basing the Oxygen Meter's {{Cap}} on how much health is left[[note]]''Hades Vanquish''[[/note]], to making it into the game's TimedMission[[note]]''Aqua Cube''[='=]s captured and submerged sibling, ''Barely Breakout![='=]s'' Rescue Puzzles, rescuing an anchored Sandy in ''Underwater Rescue''[[/note]], to having the Oxygen Meter also represent the character's LifeMeter, which means, depending on the game, drowning may be the ''only'' way they can die at all[[note]]''Sacrifice Girl'', the ''Blue Port'' series, ''Let's Practice, Takahara-san!'', ''At Night in a Party'', ''Karin's Skin Diving Diary!'', ''NATICA STAR SPLASH'', ''Lakebed Girl''[[/note]]. To play up the AuthorAppeal regarding this mechanic further, most of Fox Eye's games also give their characters [[AlmostOutOfOxygen verbal and/or vocal cues when they're running out of air]], and this is occasionally the only way to know that the character is even drowning at all if the game actually has no visible meter. Some of these same games also have ways to improve how long their protagonists can hold their breath, such as a one-use oxygen recovery item or a permanent oxygen powerup. This mechanic is used somewhat more realistically in these games than in others, as while a character is submerged, their oxygen will drop faster the more they move around, and decrease at a slower pace if they stay still while underwater.

* YouGottaHaveBlueHair: For Fox Eye's DoujinSoft protagonists and allies, Ai from ''Blue Port'', Kassis from ''Water Leaves'', Miyo from ''Sacrifice Girl'', and Medina from ''Mermaid'' all have different shades of blue hair. There are other unusual hair colors from this developer, such as pink[[labelnote:*]]the titular ''Polon'', Moka of ''Blue Port'', Asami of ''Barely Breakout!'', and Rimini of ''Karin's Skin Diving Diary!''[[/labelnote]] and green[[labelnote:*]]Momoka of ''Barely Breakout!''[[/labelnote]]. However, this also gets [[AvertedTrope averted]] as there's still a very healthy showing of natural colors such as brown[[labelnote:*]]Yuu of ''Aqua Cube'', and Yuna of the ''Sufferer'' series[[/labelnote]], dark brunette to black[[labelnote:*]]Honomi, Chie, and Kokono of ''Blue Port J'', Takahara-san of ''Let's Practice, Takahara-san!'', Karin of ''At Night in a Party'' and ''Karin's Skin Diving Diary!'', and the titular Kana of ''In the Aquarium: Sinking With Kana''[[/labelnote]], reddish-brown[[labelnote:*]]Aya of ''Aqua Cube''[[/labelnote]], and ''[[AuthorAppeal especially]]'' [[HairOfGoldHeartOfGold blonde]][[labelnote:*]]Rico of ''Blue Port'', Marie of ''Holdover'', Lorile of ''Water Leaves'', Alice of ''Barely Breakout!'', Erica of ''Mermaid'', Mana and Yurina of ''Hades Vanquish'', the titular ''BLUE GUARDIAN: Margaret'', the titular Natica and Sandy of ''Underwater Rescue'', and Fine, the titular ''Lakebed Girl''[[/labelnote]].

* {{Retraux}}: Counting all of Fox Eye's games in the list above, Fox has started developing games since UsefulNotes/TheSeventhGenerationOfConsoleVideoGames up to the [[UsefulNotes/TheEighthGenerationOfConsoleVideoGames eighth]]. However, several of them were intentionally developed as if they were made during either the [[UsefulNotes/The16bitEraOfConsoleVideoGames fourth]] or [[UsefulNotes/TheFifthGenerationOfConsoleVideoGames fifth]] generation. For some examples:

* OxygenMeter: The cornerstone of the SignatureStyle for single every game made by this doujin developer, represented by either a shrinking air bubble or a decreasing bar. Each game has it behave differently, such as having it completely separate from a LifeMeter[[note]]''Holdover'', ''The Final Escape'', ''BLUE GUARDIAN: Margaret''[[/note]], to draining health after the Oxygen Meter runs out[[note]]''Water Leaves'', ''Mermaid'', ''Sufferer''[[/note]], to basing the Oxygen Meter's {{Cap}} on how much health is left[[note]]''Hades Vanquish''[[/note]], to making it into the game's TimedMission[[note]]''Aqua Cube''[='=]s captured and submerged sibling, ''Barely Breakout![='=]s'' Rescue Puzzles, rescuing an anchored Sandy in ''Underwater Rescue''[[/note]], to having the Oxygen Meter also represent the character's LifeMeter, which means, depending on the game, drowning may be the ''only'' way they can die at all[[note]]''Sacrifice Girl'', the ''Blue Port'' series, ''Let's Practice, Takahara-san!'', ''At Night in a Party'', ''Karin's Skin Diving Diary!'', ''NATICA STAR SPLASH'', ''Lakebed Girl''[[/note]]. To play up the AuthorAppeal regarding this mechanic further, most of Fox Eye's games also give their characters verbal and/or vocal cues when they're running out of air, and this is occasionally the only way to know that the character is even drowning at all if the game actually has no visible meter. Some of these same games also have ways to improve how long their protagonists can hold their breath, such as a one-use oxygen recovery item or a permanent oxygen powerup. This mechanic is used somewhat more realistically in these games than in others, as while a character is submerged, their oxygen will drop faster the more they move around, and decrease at a slower pace if they stay still while underwater.

* SignatureStyle: As mentioned above, every Fox Eye game has one or more of the designer's many girls ([[VideoGame/AquaCube and in one case]], [[TheOneGuy a boy]]) explore underwater areas at the high risk of drowning, with an OxygenMeter of some sort to gauge how much time they have left before they drown, with various games giving you different opportunities to temporarily and/or permanently extend the meter's length. This is mainly out of both AuthorAppeal and for inviting in players that have a {{fetish}} for this material, as well. With that said, [[TruthInTelevision there is quite a lot of realistic and]] ''[[DarthWiki/NightmareFuel graphic]]'' [[TruthInTelevision effort put into how this circle portrays drowning]], such as having the heroine struggle to cover her mouth and nose, making her swimming look sloppier and/or more frantic, having her face turn blue from lack of oxygen circulation to the brain, and leveling how hard she gasps for air upon reaching the water's surface (assuming she makes it in time), which can range anywhere from exhaling her breath softly to ''painfully coughing up water from her lungs''. Due to the VideoGameCrueltyPotential of these factors, and the {{Ecchi}} content the circle has in general, this has the side-effect of making all of Fox Eye's games appear to be fully-fledged [[HGame H-Games]], and playthroughs of these games are often grouped alongside much more blatantly-explicit H-Games by content creators on Website/YouTube and Website/NicoNicoDouga (in reality, only the circle's "[[HotterAndSexier ABYSS]]" games are intentionally closer to being this way).

* TemporaryOnlineContent: Besides the mainline games listed above, Fox has also releaseed event games to download from his [=FC2=] blog almost every Christmas Eve since 2012, but ''only'' for that day, such as the above-listed ''At Night in a Party'', ''Natica and Sandy: Underwater Rescue'', and ''NATICA STAR SPLASH''. Anyone who missed these events missed out on downloading and playing these games, and may not even know that they existed due to their very limited availability making them quite obscure compared to Fox Eye's larger games, [[NoExportForYou including the lack of an English version for them]]. Five of the most popular of these games would later on [[AvertedTrope avert]] this trope by being put into a CompilationRerelease titled ''Fox Eye Limited Game Collection'' in 2019 for those that missed their events, with the games also being [[UpdatedRerelease Updated Rereleases]], with brand new artwork, a voice actress for Natica, and even an English translation for all 5 games released later on.

** In April 2021, [[MilestoneCelebration the 1st anniversary of Fox Eye's presence on Fantia]], in response to the discontinuation of UsefulNotes/AdobeFlash, Fox announced that all of the circle's games' websites that used Flash will be converted into an [=HTML5=] format so they can be fully-accessible, again (which includes most games' websites from 2008's ''Blue Port'' and ''Aqua Cube'' all the way up to 2014's ''Hades Vanquish''). The announcement of each's website's redevelopment is commemorated with brand new Fantia artwork of each game's respective protagonists, showing an even deeper look into how Fox's has improved their looks and his drawing skills since their first appearances.

* OxygenMeter: The cornerstone of the SignatureStyle for single every game made by this doujin developer, represented by either a shrinking air bubble or a decreasing bar. Each game has it behave differently, such as having it completely separate from a LifeMeter[[note]]''Holdover'', ''The Final Escape'', ''BLUE GUARDIAN: Margaret''[[/note]], to draining health after the Oxygen Meter runs out[[note]]''Water Leaves'', ''Mermaid'', ''Sufferer''[[/note]], to basing the Oxygen Meter's {{Cap}} on how much health is left[[note]]''Hades Vanquish''[[/note]], to making it into the game's TimedMission[[note]]''Aqua Cube''[='=]s captured and submerged sibling, ''Barely Breakout![='=]s'' Rescue Puzzles, rescuing an anchored Sandy in ''Underwater Rescue''[[/note]], to having the Oxygen Meter also represent the character's LifeMeter, which means, depending on the game, drowning may be the ''only'' way they can die at all[[note]]''Sacrifice Girl'', the ''Blue Port'' series, ''Let's Practice, Takahara-san!'', ''At Night in a Party'', ''Karin's Skin Diving Diary!'', ''NATICA STAR SPLASH''[[/note]]. To play up the AuthorAppeal regarding this mechanic further, most of Fox Eye's games also give their characters verbal and/or vocal cues when they're running out of air, and this is occasionally the only way to know that the character is even drowning at all if the game actually has no visible meter. Some of these same games also have ways to improve how long their protagonists can hold their breath, such as a one-use oxygen recovery item or a permanent oxygen powerup. This mechanic is used somewhat more realistically in these games than in others, as while a character is submerged, their oxygen will drop faster the more they move around, and decrease at a slower pace if they stay still while underwater.

* TemporaryOnlineContent: Besides the mainline games listed above, Fox also releases event games to download from his [=FC2=] blog every Christmas Eve, but ''only'' for that day, such as the above-listed ''At Night in a Party'', ''Natica and Sandy: Underwater Rescue'', and ''NATICA STAR SPLASH''. Anyone who missed these events missed out on downloading and playing these games, and may not even know that they existed due to their very limited availability making them quite obscure compared to Fox Eye's larger games, [[NoExportForYou including the lack of an English version for them]]. Five of the most popular of these games would later on [[AvertedTrope avert]] this trope by being put into a CompilationRerelease titled ''Fox Eye Limited Game Collection'' in 2019 for those that missed their events, with the games also being [[UpdatedRerelease Updated Rereleases]], with brand new artwork, a voice actress for Natica, and even an English translation for all 5 games released later on.

* VideoGamePerversityPotential: Can apply to every Fox Eye game that lets a heroine suffer from ClothingDamage. You can beat some of them while completely naked, and even get some unique artwork that reflects the girl's complete lack of clothing, though doing so is typically no easy feat as it often makes them [[OneHitpointWonder more vulerable to damage]].

Several of Fox Eye's non-event games can be purchased and downloaded from Website/{{DLsite}} (see [[https://www.dlsite.com/home/circle/profile/=/maker_id/RG08151.html here]]), while others are instead {{Freeware}} titles that can be downloaded either from the circle's main website or from their own dedicated websites.

* YouGottaHaveBlueHair: For Fox Eye's DoujinSoft protagonists and allies, Ai from ''Blue Port'', Kassis from ''Water Leaves'', Miyo from ''Sacrifice Girl'', and Medina from ''Mermaid'' all have different shades of blue hair. There are other unusual hair colors from this developer, such as pink[[labelnote:*]]the titular ''Polon'', Moka of ''Blue Port'', Asami of ''Barely Breakout!'', and Rimini of ''Karin's Skin Diving Diary!''[[/labelnote]] and green[[labelnote:*]]Momoka of ''Barely Breakout!''[[/labelnote]]. However, this also gets [[AvertedTrope averted]] as there's still a very healthy showing of natural colors such as brown[[labelnote:*]]Yuu of ''Aqua Cube'', and Yuna of the ''Sufferer'' series[[/labelnote]], dark brunette to black[[labelnote:*]]Honomi, Chie, and Kokono of ''Blue Port J'', Takahara-san of ''Let's Practice, Takahara-san!'', Karin of ''At Night in a Party'' and ''Karin's Skin Diving Diary!'', and the titular Kana of ''In the Aquarium: Sinking With Kana''[[/labelnote]], reddish-brown[[labelnote:*]]Aya of ''Aqua Cube''[[/labelnote]], and ''[[AuthorAppeal especially]]'' [[HairOfGoldHeartOfGold blonde]][[labelnote:*]]Rico of ''Blue Port'', Marie of ''Holdover'', Lorile of ''Water Leaves'', Alice of ''Barely Breakout!'', Erica of ''Mermaid'', Mana and Yurina of ''Hades Vanquish'', the titular ''BLUE GUARDIAN: Margaret'', and the titular Natica and Sandy of ''Underwater Rescue''[[/labelnote]].

** The first ''Sufferer'' game's was intentionally designed to be an 8-bit ActionRPG experience, to the point that Fox made his own chiptune music for the game. The tabs on this game's Japanese and English website are even spot-on recreations of the designs of [[UsefulNotes/NintendoEntertainmentSystem Famicom and NES controllers]], respectively (minus the buttons and their labels). However, its graphics (Yuna's [[GraphicsInducedSuperDeformed sprites]], in particular) more closely resemble 16-bit graphics of what can be seen in games like ''VideoGame/TheLegendOfZeldaALinkToThePast'' and ''Franchise/FinalFantasy''[='=]s UsefulNotes/SuperNintendo games (''[[VideoGame/FinalFantasyIV IV]]'', ''[[VideoGame/FinalFantasyV V]]'', and ''[[VideoGame/FinalFantasyVI VI]]'').

* UnexplainedRecovery: Tends to be [[ZigZaggingTrope Zig-zagged]]. A major factor of Fox Eye’s AuthorAppeal is how often its heroines are portrayed drowning in some sort of underwater peril as the circle's primary source of {{Fanservice}}. Mainly outside of the games, such perils tend to be drawn as hypothetical artwork, as the girl is usually shown to be alive and well by the next artwork she’s put in. However, at times, this may get {{Handwave}}d as having the heroine go through an expensive medical treatment to get revived from her drowning, or having the girl summon a HeroicSecondWind that helps her immediately spring towards the surface even after, or right before, losing consciousness. So even if they ''are'' drowned, they're never usually KilledOffForReal [[RealityEnsues unless the plot calls for it]].

* OurFairiesAreDifferent: ''Barely Breakout! Underwater [=ReMix=]'' has Momoka, an [[FairySexy attractive]] [[YouGottaHaveBlueHair green-haired]] fairy [[YourSizeMayVary that can switch between being small or being human-sized]]. Unlike most fairies, however, [[OxygenMeter she can't breathe underwater]], and as such is one of the three girls that will need to be saved from drowning in the game's [[TimedMission Rescue Puzzles]].

* YouGottaHaveBlueHair: For Fox Eye's DoujinSoft protagonists and allies, Ai from ''Blue Port'', Cassis from ''Water Leaves'', Miyo from ''Sacrifice Girl'', and Medina from ''Mermaid'' all have different shades of blue hair. There are other unusual hair colors from this developer, such as pink[[labelnote:*]]the titular ''Polon'', Moka of ''Blue Port'', Asami of ''Barely Breakout!'', and Rimini of ''Karin's Skin Diving Diary!''[[/labelnote]] and green[[labelnote:*]]Momoka of ''Barely Breakout!''[[/labelnote]]. However, this also gets [[AvertedTrope averted]] as there's still a very healthy showing of natural colors such as brown[[labelnote:*]]Yuu of ''Aqua Cube'', and Yuna of the ''Sufferer'' series[[/labelnote]], dark brunette to black[[labelnote:*]]Honomi, Chie, and Kokono of ''Blue Port J'', Takahara-san of ''Let's Practice, Takahara-san!'', Karin of ''At Night in a Party'' and ''Karin's Skin Diving Diary!'', and the titular Kana of ''In the Aquarium: Sinking With Kana''[[/labelnote]], reddish-brown[[labelnote:*]]Aya of ''Aqua Cube''[[/labelnote]], and ''[[AuthorAppeal especially]]'' [[HairOfGoldHeartOfGold blonde]][[labelnote:*]]Rico of ''Blue Port'', Marie of ''Holdover'', Lorile of ''Water Leaves'', Alice of ''Barely Breakout!'', Erica of ''Mermaid'', Mana and Yurina of ''Hades Vanquish'', the titular ''BLUE GUARDIAN: Margaret'', and the titular Natica and Sandy of ''Underwater Rescue''[[/labelnote]].

* ''[[VideoGame/TsukiToNingyoToMinasokoNoBoken Tsuki to Ningyo to Minasoko no Bōken]]'' / ''The Moon, Mermaids, and Adventures in the Bottom of the Sea'' (2012) -- Top-Down AdventureGame

* ClothingDamage: Many of their 2D games, such as ''Mermaids'', ''Holdover'', ''Sufferer'', ''Barely Breakout!'', and ''BLUE GUARDIAN: Margaret'' can have this happen to all of their protagonists as a secondary {{Fanservice}} feature, though similar to the ''VideoGame/SenranKagura'' series, as they become more and more naked, they'll take more damage-per-hit and overall become much easier to kill. In the case of ''Barely Breakout!'', this is actually invoked to beat most of the rounds and induce [[DefeatByModesty a completely different kind of "death"]] to the game's heroines.

** For an example of a involuntary use, in ''VideoGame/BlueGuardianMargaret'', if the player gets caught by a wizard towards the end of the game, Margaret is [[ShamefulStrip stripped naked]] and thrown in a tank that slowly fills with water. The first time, she passes out and has to find her stuff again. Get caught again, [[TheManyDeathsOfYou she drowns for real.]]

* IllGirl: Heroines that count for this trope tend to suffer from weaker breathholding times and concerningly shorter {{Oxygen Meter}}s. Kokono of ''Blue Port J'' has had issues with fainting for years and has no athletic skills compared to her friends, consequently having the lowest breathholding time among that game's 3 heroines. Then there's Marie of ''Holdover'', who had to be preserved and healed from a coma for ''at least'' 10 years, weakening her limbs in the process, and making her start out with the lowest breathholding time ''among Fox Eye's entire character roster''. She also burns through her oxygen faster than anyone else, and [[WalkDontSwim is completely incapable of swimming whatsoever]] [[BlessedWithSuck thanks to weight of her organ-repairing computer anklets]].

** While ''Sufferer'' wasn't too dark of a game to begin with, its ImmediateSequel, ''Sufferer: The Final Escape'', is this compared to the former. While the first game focused on Yuna escaping an island infested with hostile monsters and pirates that want to kill her, ''The Final Escape''[='=]s most notable danger is Yuna [[DefeatByModesty getting embarrassed around any other beach-goers that see her in a damaged swimsuit, if not completely naked]].

** Natica, whose first game appearance is in the event game ''Slide Loop Puzzle'', is considered a mascot for the circle’s Fox Eye ABYSS faction, alongside Karin of ''Whisper of the Sea'' and ''Karin's Skin Diving Diary'', and the titular ''BLUE GUARDIAN: Margaret''. As such, any ABYSS game that they star in will put them in HotterAndSexier situations, primarily by allowing them to [[AvertedTrope avert]] NippleAndDimed unlike the rest of Fox Eye’s heroines. Natica is also used the most in artwork that [[{{Crossover}} brings several Fox Eye protagonists together]], including Polon, herself, and has also been featured frequently in the circle's Fantia blog posts, such as starring in a couple manga-styled stories, including a weekly storyline. Similarly to Polon, Natica's affinity for diving underwater is shown to be greater than many other characters from the circle, and she currently appears to even outpace Rico as Fox Eye's [[HairOfGoldHeartOfGold top blonde mascot]].

* OurMermaidsAreDifferent: True to the circle’s devotion to UnderTheSea fantasies, mermaid characters show up from time to time. Some of Fox Eye’s human characters (such as Natica and Sandy in ''Underwater Rescue'') like to dress up as mermaids, while actual mermaids (such as Medina from ''The Moon, Mermaids, and Adventures in the Bottom of the Sea'', [[spoiler:and Rittie, the titular ''Whisper of the Sea'']]) wield mystical powers, such as increasing how long a human can [[OxygenMeter hold their breath underwater]].
* OxygenMeter: The cornerstone of the SignatureStyle for single every game made by this doujin developer, represented by either a shrinking air bubble or a decreasing bar. Each game has it behave differently, such as having it completely separate from a LifeMeter[[note]]''Holdover'', ''The Final Escape'', ''BLUE GUARDIAN: Margaret''[[/note]], to draining health after the Oxygen Meter runs out[[note]]''Water Leaves'', ''Mermaids'', ''Sufferer''[[/note]], to basing the Oxygen Meter's {{Cap}} on how much health is left[[note]]''Hades Vanquish''[[/note]], to making it into the game's TimedMission[[note]]''Aqua Cube''[='=]s captured and submerged sibling, ''Barely Breakout![='=]s'' Rescue Puzzles, rescuing an anchored Sandy in ''Underwater Rescue''[[/note]], to having the Oxygen Meter also represent the character's LifeMeter, which means, depending on the game, drowning may be the ''only'' way they can die at all[[note]]''Sacrifice Girl'', the ''Blue Port'' series, ''Let's Practice, Takahara-san!'', ''At Night in a Party'', ''Karin's Skin Diving Diary!'', ''NATICA STAR SPLASH''[[/note]]. To play up the AuthorAppeal regarding this mechanic further, most of Fox Eye's games also give their characters verbal and/or vocal cues when they're running out of air, and this is occasionally the only way to know that the character is even drowning at all if the game actually has no visible meter. Some of these same games also have ways to improve how long their protagonists can hold their breath, such as a one-use oxygen recovery item or a permanent oxygen powerup. This mechanic is used somewhat more realistically in these games than in others, as while a character is submerged, their oxygen will drop faster the more they move around, and decrease at a slower pace if they stay still while underwater.

* SignatureStyle: As mentioned above, every Fox Eye game has one or more of the designer's many girls ([[VideoGame/AquaCube and in one case]], [[TheOneGuy a boy]]) explore underwater areas at the high risk of drowning, with an OxygenMeter of some sort to gauge how much time they have left before they drown, with various games giving you different opportunities to temporarily and/or permanently extend the meter's length. This is mainly out of both AuthorAppeal and for inviting in players that have a {{fetish}} for this material, as well. Furthermore, [[TruthInTelevision there is quite a lot of realistic and]] ''[[DarthWiki/NightmareFuel graphic]]'' [[TruthInTelevision effort put into how this circle portrays drowning]], such as having the heroine struggle to cover her mouth and nose, making her swimming look sloppier and/or more frantic, having her face turn blue from lack of oxygen circulation to the brain, and leveling how hard she gasps for air upon reaching the water's surface (assuming she makes it in time), which can range anywhere from exhaling her breath softly to ''painfully coughing up water from her lungs''. Due to the VideoGameCrueltyPotential of these factors, and the {{Ecchi}} content the circle has in general, this has the side-effect of making all of Fox Eye's games appear to be fully-fledged [[HGame H-Games]], and playthroughs of these games are often grouped alongside much more blatantly-explicit H-Games by content creators on Website/YouTube and Website/NicoNicoDouga (in reality, only the circle's "[[HotterAndSexier ABYSS]]" games are intentionally closer to being this way).

* VideoGamePerversityPotential: Can apply to every Fox Eye game that lets a heroine suffer from ClothingDamage. You can beat some of them while completely naked, and even get some unique artwork that reflects the girl's complete lack of clothing, though doing so [[OneHitpointWonder is typically no easy feat]].
* VirtualPaperDoll: The art collection for ''In the Aquarium: Sinking With Kana'' features a playable visual novel with the art available. A bonus section allows the player to pose/dress Kana using a selection of preset expressions and positions. There are only a few expressions and poses available, and only two outfits. The customization emphasizes how much of Kana's [[TanLines tanned body]] [[{{Fanservice}} is showing]], and since it's an [[HotterAndSexier ABYSS]] title, [[VideoGamePerversityPotential the player can pose her completely naked, nipples and all.]]

* YouGottaHaveBlueHair: For Fox Eye's DoujinSoft protagonists and allies, Ai from ''Blue Port'', Cassis from ''Water Leaves'', Miyo from ''Sacrifice Girl'', and Medina from ''Mermaids'' all have different shades of blue hair. There are other unusual hair colors from this developer, such as pink[[labelnote:*]]the titular ''Polon'', Moka of ''Blue Port'', Asami of ''Barely Breakout!'', and Rimini of ''Karin's Skin Diving Diary!''[[/labelnote]] and green[[labelnote:*]]Momoka of ''Barely Breakout!''[[/labelnote]]. However, this also gets [[AvertedTrope averted]] as there's still a very healthy showing of natural colors such as brown[[labelnote:*]]Yuu of ''Aqua Cube'', and Yuna of the ''Sufferer'' series[[/labelnote]], dark brunette to black[[labelnote:*]]Honomi, Chie, and Kokono of ''Blue Port J'', Takahara-san of ''Let's Practice, Takahara-san!'', Karin of ''At Night in a Party'' and ''Karin's Skin Diving Diary!'', and the titular Kana of ''In the Aquarium: Sinking With Kana''[[/labelnote]], reddish-brown[[labelnote:*]]Aya of ''Aqua Cube''[[/labelnote]], and ''[[AuthorAppeal especially]]'' [[HairOfGoldHeartOfGold blonde]][[labelnote:*]]Rico of ''Blue Port'', Marie of ''Holdover'', Lorile of ''Water Leaves'', Alice of ''Barely Breakout!'', Erika of ''Mermaids'', Mana and Yurina of ''Hades Vanquish'', the titular ''BLUE GUARDIAN: Margaret'', and the titular Natica and Sandy of ''Underwater Rescue''[[/labelnote]].

* {{Freeware}}: All of these kind of games are cataloged directly on Fox Eye's website, including the Japanese version of ''Sacrifice Girl'' (which is identical to the English trial version, alternate language notwithstanding). Some of these same games, such as ''Holdover'' and ''Sufferer'' can also be freely downloaded from their own dedicated websites.