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#change is a ZZT-OOP command that lets you change all instances of a given element with another element.

The syntax is #change color element color element. In both cases, the color argument is optional. While the element argument is supposed to be mandatory, an empty string is treated as equivalent to a board edge. Providing an invalid element name will throw a Bad #CHANGE error.


  • ZZT has a limit of 150 stats. If you try to #change statless elements into statful ones, it will only produce them up to that limit - the remaining elements will be turned to Empties instead.
  • Due to a bug, errors thrown by #change do not stop execution of the command! This can cause uninitialized memory to be used as the element and/or color arguments - causing unexpected behaviour and, potentially, crashes.