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
Unlocking Monsters Edit
|Monster Locker Level||Monster Image||Monster Name||Resources Needed||Unlocking Time|
|Project X||4,096,000||2d 14hr|
Building Progression Edit
|1||File:Monster Locker Damaged 1.png||File:Monster Locker Destroyed.png|
|2||File:Monster Locker.gif||File:Monster Locker Damaged.png|
|3||File:Monster Locker Level 3 Damaged.png|
|4||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.