OK, so I just played the game with the following codes: P1 Press L to Roll 1, Press L+Y for infinite moves, and Press L+X for no more moves. All of them worked for me. For the Hold L to Roll 1 code, I held the L button when the dice block is on the screen and didn't let go until after I hit the dice...

All of these codes worked for me when I tested them. Did you remember to add the M code before adding any of the other codes?

(m) [Ralf]
CX81-TNA5-QNU3Q
EWRE-HE0A-XG5WJ

^That's the code that I'm talking about. It has to be the first code that you add, or else the rest of the codes won't work.

Glad I could help with testing these codes. Thanks to your codes I can now enjoy my favorite Mario Party game to the fullest!