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Sokoban is a tricky puzzle game that has bedeviled computer gamers for years. Apparently it was invented by Hiroyuki Imabayashi in 1982.
This implementation (xsokoban) runs on computers with ANSI C and the X Window System: in other words, most Unix (or Linux) workstations. There are 90 tricky levels to solve, and xsokoban lets you compete with hundreds of skilled sokoban players from all over the world. XSokoban is the one of the spiffiest versions of sokoban around, but it does not run under Windows. Versions of sokoban for Windows do exist. Even if you don't use XSokoban, you can participate in the global score list by entering solutions manually.