Jump to the top of the pyramid then wait for Coily to jump to one of the cubes directly below. Press Up/Right to jump off the pyramid just when he is ready to jump to your cube. Coily will also jump off and points will be awarded. However, Q*bert will not lose a life.
Get just one square away from the snake and jump toward it at the same time that it makes its jump. If you time it right, you will jump right through the snake without any harm.