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A game about building emulators! Implement your own NEEES core in JavaScript, get instant feedback with unit/video tests, build the graphics unit in real time, learn 6502 assembly, debug test ROMs, and have fun with the included homebrew games!
Linux · Jan 16, 2026
Worldwide · Exact date · Full release · IGDB
Mac · Jan 16, 2026
Worldwide · Exact date · Full release · IGDB
PC (Microsoft Windows) · Jan 16, 2026
Worldwide · Exact date · Full release · IGDB
Catalog sources
42 achievements available.

Finish the APU implementation.
LockedSteam

Finish the DMC Channel levels.
LockedSteam

Finish the Noise Channel levels.
LockedSteam

Make some noise.
LockedSteam

Finish the Pulse Channel levels.
LockedSteam

Finish the Triangle Channel levels.
LockedSteam

Complete all Assembly levels.
LockedSteam

Finish the Cartridge implementation.
LockedSteam

Finish the Controller implementation.
LockedSteam

Finish the CPU implementation.
LockedSteam

Implement all CPU instructions.
LockedSteam

Gain full control of the emulator.
LockedSteam

Pass the final full emulator test suite.
LockedSteam

Finish Robo-Ninja Climb by using save states.
LockedSteam

Finish Robo-Ninja Climb by either playing it or hacking it, without using save states.
LockedSteam

Beat Dizzy Sheep Disaster.
LockedSteam

Beat Falling.
LockedSteam

Beat Feline Flood Fiasco.
LockedSteam

Beat From Below.
LockedSteam

Beat Heist.
LockedSteam

Beat Jupiter Scope 2.
LockedSteam

Beat Minekart Madness.
LockedSteam

Beat Nalleland.
LockedSteam

Beat Raven's Gate.
LockedSteam

Beat Spacegulls.
LockedSteam

Beat Super Tilt Bro.
LockedSteam

Beat Tesla Vs Edison.
LockedSteam

Beat Wolf Spirit.
LockedSteam

Fail more than 50 tests at the same time.
LockedSteam

Reach an "Invalid opcode" error when using BrokenNEEES CPU.
LockedSteam

Open the debugger.
LockedSteam

Bring your own ROM.
LockedSteam

Fail the tests 5 times, then fix them.
LockedSteam

Hang the emulator.
LockedSteam

Quickly learn the JavaScript programming language.
LockedSteam

Load the plumber game.
LockedSteam

Open the REPL.
LockedSteam

Finish the background rendering levels.
LockedSteam

Finish the PPU implementation.
LockedSteam

Draw something on the screen.
LockedSteam

Finish the background scrolling levels.
LockedSteam

Finish the sprite rendering levels.
LockedSteam
Community notes