Source: Moscow Puzzles
Problem:
A soccer fan upset by the defeat of his favorite team slept restlessly. In his dream ,he saw the goalkeeper was practicing alone in a large room, tossing the ball against a wall and catching it.
But the goalkeeper got smaller and smaller and changed into a ping pong ball, and the soccer ball swelled into a huge cast iron ball.
The iron ball circled around madly, trying to crush the ping pong ball which darted desperately about .
Could the ping pong ball find safety without leaving the floor?
