Challenges[edit | edit source]
One Of Each Tower Challenge - Survive as many waves as possible using one of each tower. That includes gold mines, arrow towers, cannon towers, etc. You can place as many resource harvesters as you want though. You can also upgrade your towers. The average wave reached should be 20.
Tier One Buildings Challenge - Survive as many waves as possible using only tier I towers. You cannot upgrade your gold stash. You can upgrade your tools as high as you want. The average wave reached should be 10.
No Items Challenge - Survive as many waves as possible using only the tier I pickaxe. You can't upgrade your shield or have potions. You may use and evolve your pet if you like. You can upgrade buildings higher. The average wave reached should be 50*.
*You don't need items to have your gold stash survive in the game, so the No Items Challenge can get your wave up to 150 if you upgrade your buildings high enough. But you will probably die** constantly due to not having a shield, making it harder to upgrade and the chance of getting a higher wave smaller.
**Dying only loses you 25% of your resources, and all of your tools. Doing the No Items Challenge makes dying not so harmful (you would have to do the entire playthrough with a tier I pickaxe and nothing else, except resources of course.)