I am a beginning game programmer trying to make a 2D side scroller in C++, OS 9, Codewarrior LE. When I try to allocate a GWorld for a small sprite, it works, but when I try it with a large background image the GWorld Handle is NULL. What kind of things could cause this? I would appreciate any help. Thanks.

You need to allocate more memory to your program. This is an OS9-only issue. The default in CodeWarrior is something like 384KB, which is quite ridiculous for any reasonable purpose. You'll find the settings in the project preferences.

Alright, the GWorld allocates. Thanks! Now I have to work through a score of other problems!