Unlock the following bonus levels by performing the corresponding tasks:

LEVEL - HOW TO UNLOCK
Billboard-o-rama - Beat Hanging Gardens.
Blob Smash - Get a Gold Medal in Chroma City Fun Park.
Crane Fighting - Get a Gold Medal in The Chroma Dam.
Deep Down - Get a Gold Medal in Ministry of Ink.
Factory Run - Beat Chroma City Fun Park.
Forgotten Forest - Get a Gold Medal in The Docklands.
Hill Climb - Beat Ministry of Ink.
INKT Acedemy - Beat The Chroma Dam.
Inky Canyon - Get a Gold Medal in Hanging Gardens.
Jetbike Blitz - Beat Guggentraz Island.
Leaps of Faith - Get a Gold Medal in Uptown.
Lost Freeway - Get a Gold Medal in Downtown.
Miles O Silos - Beat The Docklands.
Seaside Roller - Beat Last Resort.
Ship to Ship - Beat Uptown.
Sinking Feeling - Beat Lake Raydia.
Sizzle Race - Beat Downtown.
Top of the World - Get a Gold Medal in Last Resort.
Tower of Power - Get a Gold Medal in Lake Raydia.
Trainspotting - Get a Gold Medal in Guggentraz Island.