Knockback is a workshop upgrade that gives your tower a chance to push enemies away when you hit them. It is bought with coins and comes in two parts: Knockback Chance, which controls how often the effect triggers, and Knockback Force, which controls how far enemies are pushed.
Descriptions
Knockback gives your tower a chance to push enemies away from it when your shots land. It is a defensive tool, buying you time by keeping enemies at range.
Workshop
Knockback is unlocked in the workshop for 5000 coins. It becomes available after you have unlocked Lifesteal. Once unlocked, it gives you access to two separate upgrades: Knockback Chance and Knockback Force.
Knockback Chance
Knockback Chance determines how often your shots will knock enemies back. There are 80 upgrades available, each raising the chance by 1%, for a maximum of 80% chance to knockback.
Workshop — Knockback Force
Knockback Force controls how strongly enemies are pushed. There are 40 levels in the workshop, starting from a base of 0.4. Each level adds 0.142, reaching a maximum knockback of 6.08.
There is no unit attached to knockback, so the exact effect of each point is not clearly defined. Enemy mass reduces the effect: heavier enemies are pushed less than lighter ones. Enemy mass increases at higher waves, so knockback becomes weaker the further you progress. When paired with bounce shot, enemies cannot be pushed toward the tower by knockback.
Cost — Knockback Chance
The cost table below shows the coin cost for each level of Knockback Chance.
| Level | Value | Cost | Total Cost |
|---|---|---|---|
| 1 | 1.00% | 80.00 | 0.00 |
| 2 | 2.00% | 113.00 | 193.00 |
| 3 | 3.00% | 154.00 | 347.00 |
| 4 | 4.00% | 205.00 | 552.00 |
| 5 | 5.00% | 267.00 | 819.00 |
| 6 | 6.00% | 342.00 | 1.16K |
| 7 | 7.00% | 429.00 | 1.59K |
| 8 | 8.00% | 530.00 | 2.12K |
| 9 | 9.00% | 645.00 | 2.77K |
| 10 | 10.00% | 775.00 | 3.54K |
Cost — Knockback Force
The cost table below shows the coin cost for each level of Knockback Force.
| Level | Value | Cost | Total Cost |
|---|---|---|---|
| 1 | 0.55 | 80.00 | 80.00 |
| 2 | 0.70 | 113.00 | 193.00 |
| 3 | 0.85 | 154.00 | 347.00 |
| 4 | 1.00 | 206.00 | 553.00 |
| 5 | 1.15 | 269.00 | 822.00 |
| 6 | 1.30 | 346.00 | 1.17K |
| 7 | 1.45 | 436.00 | 1.60K |
| 8 | 1.60 | 540.00 | 2.14K |
| 9 | 1.75 | 659.00 | 2.80K |
| 10 | 1.90 | 794.00 | 3.60K |
Knockback Force
See Knockback.