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