- Try to unlock and have one of each type of monster (Attacker, Defender, Looter).
- Try to unlock D.A.V.E. once you finish upgrading the Monster Locker to level 4.
- Don't spend all your Putty in your Monster Locker! Use some in your Monster Academy and Monster Lab too.
- Once you unlock every monster, you can theoretically recycle it (unless you want monsters that may or may not be released in the future).
- Do not recycle your Monster Locker before you fully upgrade your Monster Academy and Monster Lab. It is one of the requirements for upgrading those two buildings.
- You should try to unlock all of the monsters needed to feed your Champion as soon as possible.
- When it's level 3/4 it can be used (similar to the way you can use a level 3 Hatchery) to hide buildings.
- You can use it to hide defensive towers or a way/entrance of your yard.