Crystal Defenders is an interesting game when it comes to episodes. Each 'episode' isn't connected to the others, but acts as a separate game of its own, with different details and challenges.
In the App Store and Xbox Live Arcade versions, Crystal Defenders is divided into W1, W2 and W3 instead of R1 and R2 listed below. R1 includes W1 and half of W2, while R2 includes the remaining half of W2 and W3. Those versions also sold the game as a single package instead of two parts.
The original mobile version Crystal Guardians (only in Japan) had the division W1-W3. However, each of them was sold separately.
Crystal Defenders R1

R1 includes the basic Crystal Defenders game. It teaches you what Waves are, and gradually increases the amount of different units available to get you used to the mechanisms of playing.
Jobs
Archer
Black Mage
Dragoon
Soldier
Thief
Time Mage
White Monk
Maps
Aldanna Range
Baptiste Hill
Bisga Greenlands
Galerria Deep
Orchise Snowfields
Zedlei Forest

Crystal Defenders R2

R2 is a continuation of the basic game. It widens the options available to you with new units and abilities, and introduces expert maps to play on for those who want a little more challenge. The graphics of jobs you obtained in the previous episode might have changed.
Jobs
Berserker
Fencer
Flintlock
Gadgeteer
Hunter
Maps
Vanguard Storm
Vanguard Storm is the continuation of Crystal Defenders. Despite being listed along with Crystal Defenders on this page for clarity's sake, it is a sequel and an entirely different game from Crystal Defenders.

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