From the Super Mario Wiki
The player must control the tilting platform in the middle and direct it left or right. A creature will fall and the player must sort it in the right section: left section (glacier) and right section (desert). Such creatures can include otters, crabs and penguins (which should fall on the glacier side); scorpions, cacti and sphinxes (which should go to the desert). If a creature is placed in the wrong side it will freeze or disintegrate.