A tool for combining Bitsy games.

Paste your game data into the main and additional inputs, and click mix!

All palettes, rooms, tiles, sprites, items, exits, endings, variables and dialogue will be copied from the additional game to the main game. Tiles will also be deduplicated, to avoid unnecessary extra tiles in your merged game. The resulting merged game will appear in the output box. You can copy and paste this back into Bitsy.

I'm fairly confident that Mixsy won't mangle your game data, but I still recommend taking backups of your games periodically.

Mixsy requires WebAssembly, so if it doesn't work on your web browser I suggest using the native Linux or Windows downloadable versions (if applicable to you) or try bitsy merge instead.


A tool by Max Bradbury

Thanks to Adam Le Doux for Bitsy

Thanks to Freya for the colour palette (I love that watermelon and mint-choc-chip kinda thing)

Thanks to Candle, Sean and everyone in the Bitsy community

PlatformsWindows, Linux, HTML5
Rated 5.0 out of 5 stars
TagsBitsy, collaboration


mixsy.zip 222 kB
mixsy-windows.zip 8 MB

Development log


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Can you mix 3D Bitsy games?

probably not - I'm not sure if it uses the same game data format. I'll have a look though!

for some reason it was not working...

(2 edits)

which version did you use - web, windows, linux? if web, which browser do you use?

oh i figured it out! XD i forgot to edit!

and, can you make this working for



it should already work! have you tried it?

yea i did, but it didn't really work, i could only see the black background of my game and one color blue of my sword in the game.

but ima try again!

I haven't tried it myself, but I would guess that both games need to have the same number of colours in every palette