A Halloween merge puzzle: climb from candy corn to Witch Octo, on your own or with your AI.
Swipe or use arrow keys. Matching monsters merge into the next one up. Tap a monster you've unlocked to see it again.
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Monster Merge speaks WebMCP, so an AI agent in your browser can play alongside you on this board. It can always look; it only moves once you let it, and you see every move it makes.
Merge candy corn into Witch Octo, Ghostopus, Boba Bat, Monstera Mash and the rest of TryOcto's Halloween crew. Every merge unlocks the next monster's card.
Get the Halloween shirts →