660 px


Research and unlock new monsters, to be created in the Hatchery.

Building Information Edit

The Monster Locker is a building that must be built during the tutorial. It reaches a max level of four, each level unlocks more monsters. The finished build unlocks four monsters, Pokey, Octo-ooze, Bolt and Fink . The first upgrade (lvl 2) unlocks, Eye-ra, Ichi, Bandito and Fang . The second upgrade (lvl 3) unlocks, Brain, Crabatron, Project X and Zafreeti . The final upgrade (lvl 4) unlocks, Taratorn, Wormzer and D.A.V.E. If the Monster Locker is destroyed while it is unlocking, it will delay the unlock time, and continue when it is repaired. The Monster Locker only requires putty to unlock monsters.

NOTE: In the beta stage of Backyard Monsters, players were able to build two Monster Lockers. Don't be surprised if you see two Lockers in one yard, fortunately they can only unlock one monster at a time. They're still given the advantage of having a longer NEC, though.

Upgrade Progression Edit

Structure Level Resources Needed Upgrade Time Repair Time Resources Recycled Town Hall Level HP
Twigs-icon Twigs Pebbles-icon Pebbles Twigs-icon Twigs Pebbles-icon Pebbles
1 Twigs-icon 1,800 Pebbles-icon 2,300 10m Twigs-icon 900 Pebbles-icon 1,150 2 4,000
2 Twigs-icon 28,800 Pebbles-icon 18,400 5h Twigs-icon 15,300 Pebbles-icon 10,350 3 16,000
3 Twigs-icon 115,200 Pebbles-icon 147,200 20h 59m 15s Twigs-icon 72,900 Pebbles-icon 83,950 4 32,000
4 Twigs-icon 460,800 Pebbles-icon 588,800 8h 3h 33m 20s Twigs-icon 303,300 Pebbles-icon 378,350 5 64,000

Unlocking Monsters Edit

Monster Locker Level Monster Image Monster Name Resources Needed Unlocking Time
- Pokey Pokey - -
1 Octo-ooze Octo-ooze Putty-icon 8,000 1hr
Bolt Bolt Putty-icon 16,000 2hr
Fink Fink Putty-icon 32,000 4hr
2 Eye-ra Eye-ra Putty-icon 64,000 8hr
Ichi Ichi Putty-icon 128,000 16hr
Bandito Bandito Putty-icon 256,000 1d 4hr
Fang Fang Putty-icon 512,000 1d 16hr
3 Brain Brain Putty-icon 1,024,000 2d 4hr
Crabatron Crabatron Putty-icon 2,048,000 2d 10hr
Project X Project X Putty-icon 4,096,000 2d 14hr
Zafreeti Zafreeti Putty-icon 6,192,000 2d 12hr
4 Teratorn Teratorn Putty-icon 4,096,000 2d 14hr
Wormzer Wormzer Putty-icon 4,096,000 2d 14hr
D.A.V.E. D.A.V.E. Putty-icon 8,192,000 3d

Building Progression Edit

Structure Level Normal Damaged Destroyed
1 Monster Locker 1 File:Monster Locker Damaged 1.png File:Monster Locker Destroyed.png
2 File:Monster Locker.gif File:Monster Locker Damaged.png
3 Monster Locker 3 File:Monster Locker Level 3 Damaged.png
4 Locker4 File:Monster Locker Level 4 Damaged.png


Its Inferno counterpart is the Strongbox, as they both can unlock monsters. The only difference is the size and shape, Strongbox is smaller and circular and the Monster locker is taller and of an oblong shape.