At the "TV Games: Plug it in & Play" screen, while holding Start, press Left, Right, Left and Right to access several debug screens. After advancing through all screens, the game reboots.
Trackball I/O Test
A mode for testing the game's trackball controls.
A mode for testing the game's regular controls. A build date is displayed in this screen and in the Program Checksum Test seen below.
Program Checksum Test
A checksum test.
NAND Flash Test
NAND Flash Checksum Test
A second checksum test.
Save Data Test
A RAM viewer.
A self-explanatory sound test menu.
SDRAM Read/Write Test
An archive unpacking test mode.