In this NES game you pilot the only Space Fighter equipped with the Improbability Drive.

Default keybinds for the embedded emulator:

  • Start: Enter
  • A-button (fire): F
  • D-pad: Arrow keys

Originally made for Ludum Dare 49 (theme: unstable). Coded in C and Assembly (cc65 compiler), graphics made with NEXXT (an unreleased fork of NESST), music and sound effects made with FamiTracker.


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Click download now to get access to the following files:

improbability-fighter.nes (post-jam version 1.0.0) 40 kB
improbability-fighter.nes (Ludum Dare 49 version) 40 kB

Development log


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Good idea and game.

I love the NES nostalgia I get from this game 



Somehow the browser version doesn't work so I had to use emulator to play this game.

It was fun and I managed to Win the game :)

Thanks for playing :)

Could you tell me which browser you used and what exactly happened? (like if the emulator didn't started, or if the game itself didn't start inside it, etc)

I'm using Firefox , old version. The emulator seems to start but it can't find any rom to play with.


Thanks. Weird thing is, it works fine on my Firefox (the emulator is supposed to load and start the rom automatically), but a friend said they had to use Chrome instead, because it didn't run on their Firefox. Meanwhile I saw a streamer trying to play on Chrome, and they had to switch to Firefox to make it work. I swear sometimes this Web stuff doesn't make any sense... 😅


caos, puro caos, ja comecei jogo tomando tiro na cara, muito bom, gostei bastante