The amount of difficulty points per wave is determined by a complex calculation in the background of the game. It considers the current stage (the first 7 stages the difficulty increases exponentially, after that linearly), spawn location proximity to castle center (single multiplier), wave length (exponential) and simulated economy (this includes and is dependent on starting gold).
When creating waves, the game spends the difficulty points to spawn enemies. For example 18 per exploder.
-| Enemy | -Difficulty Points | -
|---|---|
| Archer | -1.6 | -
| Catapult | -6 | -
| Elite Crossbow Man | -3.5 | -
| Exploder | -18 | -
| Hunterling | -2.4 | -
| Monster Rider | -3.3 | -
| Ogre | -17 | -
| Peasant | -0.6 | -
| Racer | -5 | -
| Ram | -18 | -
| Slime | -1 | -
| Spiky Slime | -4.25 | -
| Swordsman | -2 | -
| Wasp | -5 | -
| Pikes | -3 | -
| Fury | -13 | -
| Barrel Knight | -7 | -
| Flying Mage | -8.5 | -
| Mole Knight | -6.33 | -
| Mole Archer | -4.88 | -
| Quicksling | -18 | -
| Elite Enemies | -(Normal Version Difficulty Points) x6 | -
| Enemy | +Difficulty Points | +
|---|---|
| Archer | +1.6 | +
| Catapult | +6 | +
| Elite Crossbow Man | +3.5 | +
| Exploder | +18 | +
| Hunterling | +2.4 | +
| Monster Rider | +3.3 | +
| Ogre | +17 | +
| Peasant | +0.6 | +
| Racer | +5 | +
| Ram | +18 | +
| Slime | +1 | +
| Spiky Slime | +4.25 | +
| Swordsman | +2 | +
| Wasp | +5 | +
| Pikes | +3 | +
| Fury | +13 | +
| Barrel Knight | +7 | +
| Flying Mage | +8.5 | +
| Mole Knight | +6.33 | +
| Mole Archer | +4.88 | +
| Quicksling | +18 | +
| Elite Enemies | +(Normal Version Difficulty Points) x6 | +