Stackmelt

Stackmelt is a 3D cube-merging puzzle that runs in your browser. In a tall, phone-style column you shoot numbered cubes into a box, and cubes with the same number melt together into the next number.

How to play

1. Press the green play button on the start screen.
2. A numbered cube waits at the bottom of the lane. Drag it left or right with the mouse or your finger and let go.
3. The cube shoots up into the box. When it hits a cube with the same number, the two merge into the next number.
4. Your score grows with every merge and is shown at the top.
5. When the cubes reach the top, the game is over; a screen says GAMEOVER or NEW HIGHSCORE.

What you see on screen

• Top: a pause button and the score.
• Box: an orange-floored box where cubes pile up.
• Bottom: the next cube with its number, with a pointing hand showing where to drag.
• Start screen: the title, a spinning cube, a sound button and play.

Tips

• Do not shoot from the same spot every time. In our tests, twelve shots released from the middle ended in GAMEOVER three times out of three.
• Spread your shots across the lane: twelve shots from different positions were still running in all three tries, with scores of 96, 132 and 104.
• Look at the number on your cube before you drag and aim at a cube that matches it.
• Read our cube merge tips for the numbers behind these tips.

Frequently asked questions

How do I shoot a cube in Stackmelt?

Drag the cube at the bottom left or right and let go; it shoots up into the box.

How do cubes merge?

Two cubes with the same number merge into the next number when they touch.

How does the game end?

When the cubes reach the top of the box; a screen then shows GAMEOVER or NEW HIGHSCORE.

Where do I see my score?

At the top of the screen, next to the pause button.

Can I play on a phone?

Yes. The game is a tall column built for touch; we tested it with a mouse.

Is Stackmelt free to play?

Yes. You can play it in your browser on Yes This Game with no download and no sign-up.