About
starttmux
A free browser game that teaches tmux through puzzles and a playful simulator — built for people who live in coding agents but have not yet made friends with the terminal.
What you get
Learn — ten guided puzzles across a golden path and a level-up track.
Cheat sheet — shortcuts and file basics.
Simulator — split panes, spawn pretend agents, run practice commands in a safe fictional scene. No install required.
Open source
starttmux is open source under the MIT License. Source, issues, and contributions live on GitHub.
Trademarks & disclaimer
References to Grok Build, Hermes, Claude Code, and similar tools in the simulator are educational fiction. Grok and Claude are trademarks of their respective owners (including xAI and Anthropic). This project is not affiliated with, sponsored by, or endorsed by those companies or any agent product vendor.
Simulated terminal output, agent behaviour, and scripts are for practice only. Do not rely on this site for production workflows or security-sensitive commands.
Credits
Built with Grok Build — the tool used to design and ship this project.
Inspired by tmux, the terminal multiplexer created by Nicholas Marriott and maintained by the tmux community. starttmux is a fan-made learning aid, not an official tmux project.
Start playing
New to tmux? Begin with golden path step 1, keep the cheat sheet open, then graduate to the simulator when you want to freestyle.