Putty is one of the four primary resources of Backyard Monsters. It's harvested from Putty Squishers.
- Expansion of Defensive Buildings, and some other Buildings.
- Unlocking, upgrading and researching monsters and their abilites.
- Building an Outpost.
- Enraging Monsters with a level 3 or above Catapult.
- Relocating your main yard.
- Transporting monsters into your Monster Bunkers.