ClassicZoo is a modern-day fork of the 1991 game creation system ZZT, aiming to stay close to the original ZZT 3.2 and Super ZZT codebases, while supporting modern systems and providing valuable quality-of-life improvements. Native support for DOS and new non-DOS platforms, modern and retro alike! Includes Windows, Linux, PC-9801, and the Amiga. Built-in online browser for searching worlds, complete with a list of recommended worlds for ZZT newcomers. Increased limits - multi-megabyte worlds, 256 boards per world, 64-kilobyte boards. Significantly more powerful built-in editor than the original ZZT, with syntax highlighting, copying/pasting, improved documentation, exposing undocumented functionality. Stability and user experience improvements - while not compromising compatibility with existing worlds.