WORLD 9-2 Increase time limits for 2- and 3-players
WORLD 12-1 A little gentler
WORLD 12-2 Eliminate Don't Press button at the end
WORLD 12-3 Change the width of blocks to jump to, depending on the number of players
WORLD 12-4 Reduce number of spikes by one
WORLD 15-2 Change the number of color boxes depending on the number of people.
WORLD 15-4 Widened the angle of view. More gentle except for switches and stairs