You are in a large floorless room, with nine suspended green platforms arranged in rows of three. Tiny jumps from one platform to another: move to avoid him, being careful not to fall into the void. After a while, some of the platforms will start flashing. Avoid stepping on these platforms as they will fall shortly after.
Tiny will continue to jump no matter what, and if he jumps where the platform is missing, he will fall and lose a notch of life energy. The platforms will come back up and the action will reset. To defeat Tiny you have to repeat the procedure two more times. Each time however, there will be more and more platforms that will fall, sometimes even in multiple groups, so move carefully not to fall. After a while however, the fallen platforms rise again.