TIC-80Plays in your browser
I Wonder If I Had A Younger Sister
Free to play. No install, no account.
Game dossier
- System
- TIC-80
Android app Beta 7
Your next level.
Retro Passport + XP · Time Warp · Lucky spin
Free forever. No ads†.
Passport is optional; account required. Guests can preview.
Inside the game

Download
About I Wonder If I Had A Younger Sister
I Wonder if I Had a Sister is a fanart danmaku game using characters from three sister-themed animes:nnUmaru in HimoutonnSagiri in Eromanga SenseinnShana in Shakugan no Shana
This game is inspired by Undertale.
Sponsored by our hosting partner
Your next world.
Starts here. Web hosting, VPS & dedicated servers. Make room for what comes next. Explore hosting
Hosting donated to Back2OldGames
Starts here. Web hosting, VPS & dedicated servers. Make room for what comes next. Explore hosting


Player memories
Remember I Wonder If I Had A Younger Sister? Share a memory or a tip for other players.
The next memory could be yours.
Sign in to leave a memoryLoading the memory card…