To make a character jump you have a choice between the "z" key or the ">" key.

In order to progress through Platform you will need to be proficient in wall jumping. If the character is sliding down a wall, pressing the jump key will make him perform a wall jump.
Using wall jumps, it is possible to climb the sides of walls. If you keep holding the movement key towards the wall you are jumping off, a quick sequence of wall jumps will allow you to climb to the top of any wall.

Click next to read about installing Shockwave.