Instructions
Play through the game until you reach the "Skate to Victory" level. This is the third level in "The Gardens," which is the first major area, or planet, in the game.
Run to the right and jump onto the bird to swing over to the next area. Jump onto the mills to get over the swampy areas.
Proceed to the right until you reach a large cog wheel. Grab onto the bird and ride it up to the next area. Jump off to the right and collect the Camera Tool -- an in-game tutorial will follow.
Run to the right, where you will find a Jetpack. Grab it -- another tutorial will follow -- then use the Jetpack to fly over the treetops until you get to a gate.
Move the barrels and place two of them into the box near the gate -- this will unlock the gate and allow you passage to the next area. Run along the linear path, past the ghosts.
Grab the crate at the end of the path and move it so you can jump onto it, then onto the upper platforms. Hit the button on the third platform to open the gate across the way.
Walk through the gate and watch for the ghost -- it comes in abruptly and at an angle, so be ready to dodge it. Run past the ghost to the next area, where a button is waiting for you.
Hit the button to make a shoe appear. Jump on the shoe, and ride it up. Jump when the shoe reaches its highest point -- this will give your boost a jump. Move to the right as you fly through the air to find and collect the Challenge Key -- it is hanging from the ceiling near a ghost.