I assume you're using GOSUB in your code, right? Make sure you have a RETURN to return to your main loop. Basically, the game seems to be running out of memory because it keeps getting a GOSUB without a RETURN, like this: @T1 GOSUB @T2 @T2 GOTO @T1 SmileBASIC tries to keep track of where the last GOSUB was so it can return there once it hits the RETURN command; However, it can also...