EXP Doesn't come Easy if you're not Trying to get it, here are some of the ways to Increase EXP:

• Achievements and Beating Bosses are the Source of Large Sums of EXP however they only happen Once

• The Night Rewards Upgrade can give some Extra EXP when Beating a Night

• The EXP Booster gives you Twice the Amount of EXP and can Double the Amount of Night Rewards EXP

• DLC Characters Will Multiply the Amount of EXP you were Going to get by How Many DLC Characters you have On +0.5

• Combining the EXP Boosters and Having a Few DLC Characters On as well as Many Normal Characters On can give you up to 100 EXP a Night