Yellow has no use. Green can climb. Blue can walk on water and swim fast. White can climb and cross water and is faster than blue. Black can jump high, climb, cross water, and are faster than white. Gold/Pink/Red can fly, climb, cross water, don't take fall damage, and are the fastest. Purple can fly, climb, cross lava, don't take fall damage, as fast as white and black, and are immune to fire.