It is possible to get your partner Kooper to give Mario a kiss with a glitch in the Ice Palace chapter. During a puzzle that requires the player to discover the real Bombette amidst several imposters, the player can leave the room and re-enter it by clipping through a wall. Upon re-entering, if you have changed your partner to Kooper, Kooper will kiss Mario upon solving the puzzle instead of Bombette as intended. Doing this with partners other than Kooper causes the game to crash.