Trelemar's Mario Bros game as default save ID. This was also my first time using modulo operator in Lua.
Use up and down to navigate through PMEM indexes. There are 256 of them total.
Use left and right to modify the value held in the PMEM index.
Use Z key (A button) to reset the PMEM index value to 0. Useful for resetting a high score.
Only works properly in native TIC-80 versions, web version will treat all PMEM values to 0 on load/reset.