What cheat codes have remained in your memory to this day?

[shloob]

what;s funny is the stage select code i remember for teenage mutant ninja turtles 2 the arcade game is d d d d d r r r r r r r B A select start

The blood code for MK1 d u l l a r d

and debug for mk2 on sega saturn l d l r d r l l r r