Reference

PICO-8 is built on the Lua programming language, but does not include the Lua standard library. Instead, a small api is offered in keeping with PICO-8's minimal design and limited screen space. For an example program that uses most of the api functions, see /DEMOS/API.P8

Functions are written here as:

FUNCTION_NAME(PARAMETER, [OPTIONAL_PARAMETER])

Note that PICO-8 does not have upper or lower case characters -- if you are editing a .p8 or .lua file directly, function names should all be in lower case.