https://www.zachtronics.com/tis-100/

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About TIS-100

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TIS-100 is an open-ended programming game in which you rewrite
corrupted code segments to repair the TIS-100 and unlock its secrets.
It's the assembly language programming game you never asked for!

  * Print and explore the TIS-100 manual, which details the
    inner-workings of the TIS-100 while evoking the aesthetics of a
    vintage computer manual!
  * Solve more than 20 puzzles, competing against your friends and
    the world to minimize your cycle, instruction, and node counts.
  * Design your own challenges in the TIS-100's 3 sandboxes,
    including a "visual console" that lets you create your own games
    within the game!
  * Uncover the mysteries of the TIS-100... who created it, and for
    what purpose?