See also: Crystals
Coloured Crystals are collected in a normal level to unlock the Crystal Door at the end, which usually contains a challenge in which Croc must complete in order to get the final sixth Gobbo in the level. They are found in Smash Boxes, disguised as regular crystals, or just laying around. They can be used to unlock the Crystal Door by finding all 5 of the Coloured Crystals on a level. The crystals come in five colours: Red, Purple, Green, Blue, Yellow; and White (in order to camouflage coloured ones) which will change back into a coloured crystal once collected. The disguised crystals also add one regular crystal to your count. This may help when Croc is hurt (so he doesn't lose a life) and helps to get the goal of 100 crystals which awards an extra life.