Tetris Worlds (GameBoy Advance (GBA)) Cheats & Tips
Cheats, codes, tips, hacks, how to's, and walkthroughsChange Start Screen
While you are at the start screen, hold R to make background spin, and L to change directions.
Unlock Classic Mode
While you are at the main menu, highlight "Marathon". Hold L, and press Select. Then, go to Marathon and Popular.