Adopt a Monster

Adopt a Monster is a fairly simple but addicting merge game. Merge two identical creatures on the board to create new monsters. Fill orders from all kinds of legendary ghouls for cute little monster pets.

From haunted lanterns to poisonous toads, you can create all kinds of unexpectedly cute Halloween creatures.

How to play Adopt a Monster?

Tap on the monster market stall to gain a new creature. Merge two of the same kind together by clicking and dragging one creature on top of another. 

To the left of the board, you’ll see your spooky customers. Each monster wants one or more pets. Look at the speech bubbles to see which monsters you need. Keep merging to unlock the right ones, and then tap on the checkmark beneath the speech bubble to give them to your customer.

The money you earn will allow you to unlock more space on the board. Click on the coffins and open them to add free that square.

Boosters

You also have several boosters you can use. To the right of the board, you have a button that allows you to upgrade one random item. This button will start recharging directly after you’ve used it.

In the bottom right corner, there is the market stall. Move items here to upgrade them. Each item takes time to upgrade at the market. The higher the item’s value, the more time it will take to reach the next stage. If you find you need the item after all, click on the X to stop upgrading, and then drag it back to the board. 

Play more free online games like Adopt a Monster

If you like this game, take a look at our Halloween games page for lots of other spine-chilling adventures. Looking for a spooky merge game with slightly more depth and complexity? Try Mage’s Secret.

Or take a look at our collection of monster games.

Who created Adopt a Monster?

Adopt a Monster was created by BestPhysics.

When was Adopt a Monster released?

This game was released on October 23, 2026.