Tiny Select Ralph as a character, then intentionally die. Then, quickly press Select, A, B(2), Up, Down, Forward, Back after transforming into a person.
Link mode Hold down Select and press Up, Down, Left, Right, Down, Up at the options menu . The "Players 1 or 2" option will be unlocked, which allows the two player mode to be played on two Game Boy Color systems using a link cable.