In each chain, winning a stage in Campaign opens the next one: stage 15 opens stage 22; stage 16 opens stage 17; stage 18 opens stage 19; stage 20 opens stage 21; stage 23 opens stage 24, which opens stage 25, which opens stage 26. The Campaign waves of all 26 stages add up to 404. Every stage is also played as a Heroic Challenge and an Iron Challenge.
Main campaign7 waves, 265 starting gold, 20 lives.
Main campaign7 waves, 220 starting gold, 20 lives.
Main campaign11 waves, 300 starting gold, 20 lives.
Main campaign13 waves, 520 starting gold, 20 lives.
Main campaign15 waves, 700 starting gold, 20 lives.
Main campaign17 waves, 700 starting gold, 20 lives. Boss: The Juggernaut.
Main campaign16 waves, 700 starting gold, 20 lives.
Main campaign18 waves, 800 starting gold, 20 lives.
Main campaign19 waves, 800 starting gold, 20 lives. Boss: J.T.
Main campaign19 waves, 800 starting gold, 20 lives.
Main campaign19 waves, 1,300 starting gold, 20 lives.
Main campaign15 waves, 1,300 starting gold, 20 lives. Boss: Vez'nan.