Games Like PlayASM

Understand what a computer actually is.

Underneath every game you've played and every message you've sent, a machine is doing something almost absurdly simple: reading a number, deciding what it means, and doing what it says. PlayASM lets you program that machine yourself, one instruction at a time, with nothing hidden and nothing automatic. PlayASM is a complete CPU simulator and a hands-on programming game. Write real assembly, step through your program and watch every register, flag and byte of memory change as the processor makes each decision. Then take those skills and build something of your own.

Learn by doing: 150+ missions

Start from zero. Missions take you from your very first instruction to real problem solving, each with a short explanation and a hands-on challenge.

No prior experience needed. If you already code, the later challenges will still make you think.

See everything. Hide nothing.

A whole machine to play with

Once you know the basics, the CPU comes with a full set of simulated hardware, all memory-mapped and all yours to command:

Build whatever you can imagine

Draw fractals pixel by pixel. Compose a soundtrack. Write a text adventure, a platformer or a scrolling shooter. Teach a robot arm to sort objects by color. Wire a lever to a door in a 3D world.

Make it your own with mods

Extend the machine with your own custom devices, with full Steam Workshop support. A mod is just a folder with a JSON layout and a Lua script, with its own window and memory slice. No compiling, no restarting. Share yours and install what others build.

Who is it for?

This is not a toy version of how computers work. It's the real mechanism, built small enough to fully understand.

Available in 12 languages

English, Deutsch, Español, Français, हिन्दी, Italiano, 日本語, 한국어, Português, Русский, Türkçe, 中文