The series contains five linear installments, a prequel, and two fan-made sequels.Six of the gamesnote (plus the Luna Game 0 Demo, which has its own unique ending) can be found at this site, but don't click the link. Just don't.Unity Of Factors has released a track dedicated to the game on their bandcamp.There has also been a Spiritual Successor series called Dreamy Rainbow.Tropes that apply to the entire series:
Anonymous Author: The creators of both the canon series and the fan game have kept their identities hidden from the community.note (slightly subverted with the former, whom had shared his identity only with a certain Strawberry Spice—an administrator to Equestria Gaming (previously) and ambiguous friend—both in order to help stay anonymous and maintaining the author's site)
Scare Chord: The first hole in the ground you jump over causes a distorted version of Fluttershy's "COME OUT" to play, and jumping in to any hole causes her distorted "LOVE ME!!" to play (complete with scare-image).
Driven to Suicide: This is implied when Luna is forced to jump off of the cliff.note (possibly to escape her traumatic visions/nightmares)
Easter Egg: On the chance the player is not able to outrun the darkness in Hell and falls into the abyss below, a series of grimdark Fan-Art images will flash before the player before the game closes.
Additionally, one of the images happens to be another one of CrappyUnicorn works. Though, the image is too dark to fully be seen in the game; there is an inscription which reads: Vengeance taken — Will often tear the heart — And torment the conscience
Phantom Zone: A true, nightmarish hell-of-a-world unlike any other to which Luna arrives at after falling into the darkness of Hell. Once the end of this area/the game is found, it is strongly implied Luna is truly Killed Off for Real when/(if) the player attempts to reopen the game; only to be presented with the text:
100% Adoration Rating/Close-Knit Community: Luna was treated much nicer by the mane six in the demo than in the full version.note i.e. being nice from the start, complimenting her with kind words, and giving her the time of day
The Aloner: This is strongly hinted for Luna towards the end.
Luna is requested by the mane six to collect a series of seemingly boring, monotonous items, until the last one she collects commands her to kill Pinkie Pie.note It may also fall under Notice This since it would not appear until the rest have been collected, plus the fact that is mostly void of color
The Corruption: It is implied near the end that Nightmare Moon had began to call Luna into darkness again.
After the Nightmare Moon scene, the player can choose to go back to where they collected the items instead of going back to the main area. Here, the player will find all the items in their original spots and if Luna touches one of them; thunder will sound, the game will glitch out—showing an image of a moment earlier in the game—and prematurely close.
Fetch Quest: Depending on the player's choice, Luna will have to gather/collect/retrieve a series of itemsnote books (for Twilight), apples (Applejack), carrots (Fluttershy), snowflakes (Rainbow Dash), candies (Pinkie Pie), or gems (Rarity), each with their own unique stage.
Kick the Dog: Luna killing Pinkie Pie when she offered to throw her a party. (Even though Nightmare Moon's influence over her made her do it.)
Multiple Endings: But it's not a choice in the game itself that decides if you get the good ending; rather, it's whether or not you've completed Luna Game 4 and 0, and have kept the files that prevent you from playing those games again.
Continuity Nod/Homage: A lot of elements used in the previous games are again featured in the Fan Sequel.note such as a Super Ponybeat track being used in the game's beginning, several of the ominous tracks were reused, etc. Also note that a lot of the content in Luna Game 5 was actually just reused from the other Luna Games, next to nothing was actually originally made.
A hidden Pinkie Pie can be found shortly after the shadow ponies.note The static that pops up when you enter the third stage appears randomly. If you run to the first raised ground after the shadows when it happens, you'll see Pinkie staring straight at you. It ties in perfectly with the ending.
If you hold down the keys "I" "T" and "K" before the game turns creepy, you will be greeted with a Pinkie screamer. If you hold them down in the room with the red sky, the static will run againnote If you are standing just before the chase event the first time you press them, you will see the monster presumed to be chasing you. The keys do nothing in the later rooms.
As Homage, the end sequence uses an almost perfect port of Giygas's Lair from EarthBound.
The Fourth Wall Will Not Protect You: Just before the game crashes, the words "You're Next" appear on the screen before a Zalgofied Pinkie is shown staring straight at you. To add insult to injury, your CD tray pops open at that exact moment.
Pressing Alt+F4 once the game takes a turn for the darker will close it down. A few seconds later it will come back with Pinkie Pie laughing at your failure.
Subverted with Ctrl+Alt+Del. While the game will yell at you, it won't actually stop you.note You still won't be able to move your mouse cursor.
Pressing Escape after the game turns creepy won't end the game, but another laughing sound will play.
Inverted in that pressing Escape or Alt+F4 will end the game if you haven't progressed to the creepy part yet.
Womb Level: Though Giygas's Lair is really a cave, the scene leading up to it involves jumping into Pinkie's mouth, followed by chewing/swallowing sounds, and ending with heartbeat sounds that continue subtly in the background until you leave the level.
This trope can be taken literally by a controversy over a belief that The Devil's Machine (i.e. Giygas's Lair) is a representation of a giant female reproductive system.
Luna Game X
Eye Awaken: Pinkie does this at the end of a cutscene, just before she charges at you
Another very short fan-parody of the Creepypasta series, made by CertaintyPrinciple, which particularly puts light to the part in the first game where the player has a possibility of getting stuck in a pit. Can be found here.