Challenges
Currently we there are two different challenge modes: Random & Endurance.

Random

Challenge mode is a basic fun only mode. You are pitted against a random player. A chance to practice your deck without consequences, but also without any reward.

Endurance

Endurance mode is not for the feint hearted. The enemy boss has 999 HP, kills troops that get too close, and continually gets his deck bolstered. Fortunately the goal is not to win, simply survive as long as you can before you are defeated. Your kill score is displayed in the bottom left corner and Blue Gems are awarded when you are defeated. The more kills you make the more gems you get.
12 Kills
1 Blue Gem
38 Kills
2 Blue Gems
78 Kills
3 Blue Gems
123 Kills
4 Blue Gems
171 Kills
5 Blue Gems
219 Kills
6 Blue Gems
267 Kills
7 Blue Gems
315 Kills
8 Blue Gems
363 Kills
9 Blue Gems
411 Kills
10 Blue Gems
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Outline
Random
Endurance