Tetris The Absolute The Grand Master 2 PLUS

Tetris: The Absolute: The Grand Master 2 PLUS is among the more "expert" versions of Tetris, well known for both its word salad of a title and its shameless, sadistic cruelty on harder settings.

Debug Mode
This delicious word salad of a game title has a debug mode, enabled by setting RAM address to.

Most codes seem to be a mix of Start and a direction. List is incomplete and may be wrong:
 * Start + Down: Locks drop speed at 1/3 G.
 * Start + Right: Increases your current level by 100, but game logic drops it back to _99 after the piece locks (functionally, jumps to level 99 of the current section).
 * Start + Up: Sets all M-roll flags, sets your grade to S9, and changes your level to 899.
 * Start + Left: Sets your grade to S8 and changes your level to 899.

*061603  hang on... something's fishy here...                   my credit rolls are fully visible, but I still get GM rankings...
 * 061906  there's some strange reactions going on here.
 * 062117  I can't quite discern a difference between Left and Up right now...