History VideoGame / HappyTreeFriendsAdventures

* ObviousBeta: The earlier games. Good thing the series keeps improving.

* BonusBoss: [[spoiler:Flippy]] in HTFA 2, which can be only fought [[spoiler:by accessing in a hidden level select screen]].

** In HTFA 2, you can simply farm lives [[spoiler:from the boss battle against [[BonusBoss Flippy]], which will always give you 20 extra lives after defeating him]]. Considering that a session can be done in roughly 2 minutes, this makes the whole life-farming in this game a borderline GameBreaker.

* SecretLevel: There's one in HTFA 2. [[spoiler:It merely consists of a boss fight against [[BonusBoss Flippy]], where beating him gives you 20 extra lives to start your adventure with.]]

* ''VideoGame/AlteredBeast''

The series involves the main cast of HTF as they have to rescue Giggles (now Allay as of ''2'') from Bowser (the main villain of the ''Franchise/SuperMarioBros'' series), and the game is a crossover with many famous video game franchises like ''Mario'' (the most of it), ''Franchise/MegaMan'', etc. and the gameplay is a style of... you guessed it, {{Creator/Konami}}'s NES games. The game is made in Multimedia Fusion 2/Clickteam Fusion 2.5 and the series was begun back in 2009, and plenty of sequels and spin-offs were made (in total of 11 as of 2017), many of them still being made or on hiatus. The list of the series' games are here:

** The later games also deal with {{VideoGame/Contra}}, ''Franchise/MegaMan'', [[AdventureIsland Adventure Island]], and some other franchises from the NES and from Konami.
** Not to mention that {{Twinbee}} (as well as Winbee) also appear in this game as the heroes' spaceship/submarine.

* LevelGoal: The ''VideoGame/SuperMarioWorld'' gates in HTFA 1, the "GOAL" sign in HTFA 3, defeating [[Franchise/SuperMarioBros Birdo]] in HTFA 5, and the ''[[VideoGame/SuperMarioBros1 Super Mario Bros.]]''-esque flagpole in HTFA Land and ''Maker''.
* LevelsTakeFlight: In HTFA 2, there's one level where you ride either TwinBee or WinBee to go to the outer space.

* OffModel:
** In the first three HTFA games, Flaky had visible ears, which coincidentally makes it an accidental DevelopmentGag on part of the actual show (one of the early HTF concept arts depicts Flaky (at that time named Corky) with ears).
** Giggles lacked her diamond-shaped marking on her head in those three games as well.
** Petunia was depicted with a flat tail, also in those first three HTFA games. Unfortunately, Nutty's tail (same case as Petunia's) wasn't revised at all in HTFA 4, unlike Petunia's.
** Related to those games, pretty much every Happy Tree Friend not named Cuddles (except for [[spoiler:Flippy in HTFA 2 only, whose sprite was taken from ''Flippy Attack'' instead]]) suffer from this because of how awkward the sprite edits look (weirdly enough, neither Giggles nor Petunia use their own sprites from the same game where Cuddles's sprite originated). It was until HTFA 4 the ''Blood Money'' sprites became slightly polished, and by HTFA 5, Radel pretty much ditched those sprites.
** Tacho the wolf has [[http://lanathewolf.deviantart.com/art/Tacho-137033320 two]] [[http://lanathewolf.deviantart.com/art/Tacho-new-style-165302870 designs]], the second of which being his updated look. Despite this, Radel still prefers to use the older one.
** The canon HTF characters' mugshots still use their pre-TV series design.
** In HTFA 1, [[spoiler:Giga Bowser looks more like a plain gigantic version of Bowser than the [[VideoGame/SuperSmashBros Super Smash Bros.]] monster he's known for]].

* LongTitle: The name ''Happy Tree Friends Adventures'' is already quite long, but with the addition of title "suffixes" or subtitles, it becomes even longer. People usually refer to the series as either "HTF Adventures" or simply "HTFA".

* OfficiallyShortenedTitle: Radel himself doesn't mind calling the series' title "HTF Adventures" or simply HTFA. The title's full name qualifies as a LongTitle anyway.

* ClassicVideoGameScrewYous: Let's see here, AutoScrollingLevel that is often found in any of the games, SlippySlideyIceWorld levels (though not too terrible compared to the others in this list), the all too-common GoddamnedBats and DemonicSpiders, lack of MercyInvincibility in the early games... the list goes on.

* SturgeonsLaw: Applied to HTFA Maker, obviously, since the levels are user-generated.

** UpToEleven in HTFA 2, where you can simply farm lives [[spoiler:from the boss battle against [[BonusBoss Flippy]], which will always give you 20 extra lives after defeating him]]. Considering that a session can be done in roughly 2 minutes, this makes the whole life-farming in this game a borderline GameBreaker.

* LoadsAndLoadsOfCharacters

* AdaptationalBadass: Bowser, and that's Radel999's favourite character. He was notable for kidnapping Allay, allying with creepy aliens, and summoning his koopalings to try to end the heroes. He as well made [[spoiler:a giant mecha]] in HTFA 6 and he was once friends with the HTF villains.

* BlindIdiotTranslation: Radel999 is Polish and he hasn't a really good English, so the games serve many typos from his Engrish.

** For an enemy example, the Koopa Muscler in HTFA 6. From the name alone, Radel999 didn't even try to hide the fact that it's [[VideoGame/MegaMan5 Power Muscler]] with a Bowser-like face.

* AWinnerIsYou: Hilariously, some HTFA games' credits have these Engrish style sentences because of Radel999's English grammar.

* TheAmazon: The forest stages.

** In HTFA GB, during the introductory cutscene, Bowser's thought bubble briefly shows Allay having wings similar to those of [[VideoGame/{{Touhou}} Flandre's]].

* FrickinLaserBeams: For his Special Power, [[spoiler:Izzy carries a RayGun that he can use to shoot laser, probably to make up for the fact that his Digimon partner doesn't appear in the series]].

'''''Happy Tree Friends Adventures''''' is a fangame based off the ''WebAnimation/HappyTreeFriends'' series created by a Polish Creator/{{Konami}} fan named [=Radel999=] (or [=HTFMegaman=]) from Website/DeviantArt.

* EarWings: The rainbow critters have these.

* SequelDifficultyDrop: While the first three HTFA games are horribly affected by FakeDifficulty in the form of clunky physics and mechanics, the last of the three is considered much easier than the first two. Boss battles can be easily exploited, levels are made easier and there are almost no tricky enemies.
** When it comes to the more "fixed" engine, HTFA 5 is considerably easier than HTFA 4, also for the same reason as the above sans the exploitable boss battles. Both have difficult bosses on their own, though.
* SequelDifficultySpike: Try playing HTFA 6 right after HTFA 5. The legitimate difficulty added is so sudden that players can end up dying more often in the former than the latter.
* SequelHook: HTFA Land has the words "To be continued..." after the credits, hinting at a possible sequel. Said sequel has been revealed as ''Happy Tree Friends Adventures World''.

* GameEngine: The series runs on a game engine made by Radel999 himself called "Happy Engine Friends".