Unlock Levels
When you complete the indicated task the corresponding levels will become available.
| To unlock... | ...you have to: |
| Levels 11-20 | Complete any map with Difficulty Level of 10 |
| Levels 21-30 | Complete any map with Difficulty Level of 20 |
| Levels 31-40 | Complete any map with Difficulty Level of 30 |
| Levels 41-50 | Complete any map with Difficulty Level of 40 |
| Levels 51-60 | Complete any map with Difficulty Level of 50 |
Useful Tower Numbers
Once you've finished any map in "Survival Mode" a new game mode will be unlocked where you can randomly alter the attributes of your towers. Below are some useful numbers:
| Code: | Effect: |
| 01000 | Long range missile towers |
| 01275 | Long range gun towers |
| 01205 | Very strong but expensive missile towers |
| 01234 | Cheap missile towers |
