Gamer has been removed
I would like to complement the solution xX Titeuf 50 Xx
If you finished the game this will be useful. As noted in the solution comments, on the level "Flurry of Activity" in the Chapter 4, starting the level there's a metal power pellet and 10 ghosts. Eat the 10 ghosts and keep moving to the next checkpoint. When you are there, return to chapter map and repeat.
(Sorry for my English)