HTML and CSS on Ao3 is an awesome tool that allows for some amazing fandom applications. I have made a habit of collecting these resources, but one of the coolest types of fics I've found are actual interactive games in Ao3, and me being the html tryhard's self-appointed librarian, I've decided to compile these together in both my resource doc and on this tumblr post.
But can it run Doom? by gifbot: Play Doom with every ao3 user on the page!
Tropémon by gifbot : an Ao3 based pokemon game!
Nethack Sokoban by gifbot: a puzzle game
I Don’t Think We’re Ready for the Takeoff by gifbot : besides being a phone with interactive bits, you can play flappy bird
Conway’s game of life by gifbot
I Crush Everything by gifbot: play as squid that crushes things!
Five Times Luna Saw Snape Die (and One Time She Didn’t) by gifbot: Harry Potter Point and click adventure
Changing the game by mackerel_cheese: A really cool Game Changer mini-game style fanfic
New Roman Times Games by mackerel_cheese: play percy jackson themed word games
Mythomagic, 1st Edition: Battle of Olympus by mackerel_cheese : percy jackson card game simulation fic
do you believe in coincidences? by mystyrust: danny phantom phone fic
Romance Route DLC by jihnari: a The Hundred Line -Last Defense Academy Dating Sim hosted IN ao3!
Thousand Illusions by BurntMochicha: Dr. Stone Visual novel
Makoto Calls Byakuya a Bitch: An Interactive Fic by solace_at_last: Dangan Ronpa Visual Novel
Project Sekai Ao3 edition by polyneedpilled: Rhythm game IN ao3
Tower of Hanoi by the_untamed_poet25
Simon Sequence Game by the_untamed_poet25
Several Hangman games: X X X X X X X X X X by the_untamed_poet25 Hangman collection
Who Stole the Treasure on the Sunny by the_untamed_poet
Hunt the Whumpus by Charles_Rockafellor
Bubble-pop! Game by Charles_Rockafellor
Heark’s character creator by heark
Closed Loop System by One_of_Them (greenbean_paste) Murderbot diaries fic with PLAYABLE minesweeper
spare time by One_of_Them (greenbean_paste) sad bowling game
Sudoku in Heart Flutter Against the Stars by WordsofWilderness: Sudoku in a Harry Potter Fanfic
Snao3ke by taxen99 : Snake!
windows9ao3 by taxen99: don’t know if this technically counts since its a computer but its very cool
Figured You Out - by Suzukitich multiple logic puzzles
Logic Grid Puzzle Work Skin & Tutorial by BookKeep
The Case Of The Clickable Murdle by VThinksOn
Special thanks to @gifbot for both making a bunch of these games, but also making me aware of more games I had missed when making this.