The 7th Guest/Walkthrough

The aim is to get from the arrow in the bottom left to the arrow at the top right. You step onto the final arrow as the last blocks drop. As you step off the coloured blocks they drop away behind you according to a certain rule. Standing on;
 * Purple, the block will fall after three steps.
 * Orange, the block will fall after two steps.
 * Blue, the block will fall after one step.

Solution
Follow the route from START to FINISH.