Survive 35 rounds and save as many slimes as you can!

Welcome to Happy Merger, the cheerful little game where absolutely nothing can go wrong…

…Until it does.

Beware of "The Nothing"

A dark, insatiable force lurks in the shadows. "The Nothing" is a powerful, invisible slime that stalks its prey. Every time you make a move, it moves too—slowly fading from view as it hunts.

But The Nothing isn’t unstoppable. If it eats a slime or interacts with certain items, it will briefly reappear, giving you a chance to track its position and fight back.

How to Win

Your goal is to survive until salvation arrives. Rescue as many slimes as possible to unlock powerful upgrades that will aid you in your fight.

Can you master merging and use your tools wisely to make it through all 35 rounds without losing a single slime? If you do, you’ll unlock the ultimate endgame challenge.

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How "The Nothing" Reacts

Moves "The Nothing" (Counts as a move)

• Moving a slime to an empty space
• Merging 3+ neighbouring slimes of the same colour into one
• Merging 3+ neighbouring coins into one (bonus coins!)

Makes "The Nothing" Visible Again

• The Nothing eats a slime
• The Nothing interacts with certain items

Does Not Count as a Move (The Nothing Stays Still)

• Clicking to collect a coin
• Placing an item from your inventory

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Items & Tools

Use these to your advantage!

• 💥 TNT – Explodes when placed down. If dropped directly on The Nothing, it will stun and reveal it.
• ⚠️ Landmine – Explodes when The Nothing steps on it, stunning it for 2 turns.
• 🚨 Alarm – If The Nothing moves within its surrounding tiles, it goes off and reveals it.
• 🔵 Merge Ball – Allows you to merge 2 slimes into 1 instead of needing 3. It also extends the reach of merges, enabling connections between slimes that wouldn't normally be adjacent.

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Playing on Mobile?

The game works in-browser on mobile! Just avoid pressing fullscreen mode—things might get weird if you do. 🤙