In BTD 6 you will get XP bonus depending on what mode you're on

Beginner: .5X XP
Easy: .7 XP
Medium: .9 XP
Hard: 1 XP
Deflation: 1.2 XP
NLL: 1.3 XP
Apopalypse: 1.45 XP
Insane: 1.5 XP

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