Crystal

Crystals are the items that are Crash collects to stop Cortex. Crystals are collected by finishing a level( except boss levels and levels after 25). Usually, you need to collect 25 crystals, although it's 21 or 142 in CTTR (21 is the minnnum needed to complete the game, while 142 is 100%). Since Crash Twinsanity ,they've been called Power Crystals.

Appearence : Most Games, ones that don't are Crash 1 and the console version of Crash of the Titans.