Gems Are The Key

What you can't do if you have a lot of gems? Simple answer is there's nothing you can't do. With gems, you can

• Buy powerful weapon and armors in the shop.
• Buy powerful elements in the shop.
• Upgrade inventory items and weapon skills without fail.
• Finish the game easily.
• Get all rare items in Mystery Box.

How to Get Gems?

You can purchase it with Google Wallet:

Or you can earn it by clearing Boss Rush floors:

Earn x40 gems in Boss Rush 4

Earn x30 gems in Boss Rush 3

Earn x20 gems in Boss Rush 2

You can earn x90 gems if you can clear Boss Rush floors in a day.

You can visit the official Glu forum to learn how to earn more than x90 gems a day.