Turf is used to unlock tier 4 towers and their skills. Each type of tower has three tier four upgrades. Each one has a specific cost, and each one has two skills.
| Type | Cost |
|---|---|
| Cheapest | 20 Turf |
| Medium | 30 Turf |
| Most expensive | 40 Turf |
All skills cost the same amount of Turf: 40.
Check the V-Search Center to see how much tower upgrades cost.