Slabspire

Slabspire is a one-button stacking game. A slab slides across the top of your tower; you drop it, whatever overhangs is cut away, and the next slab has to fit on what is left. Each slab you place adds one point, and a run ends the moment a slab misses the tower entirely.

How to play

1. Press Start (or Space). The first slab begins to slide over the stone plate at the bottom.
2. Click, tap the screen or press Space to drop the slab. Slabs alternate between sliding left to right and front to back.
3. Part of the slab that hangs over the edge is cut off and falls away. The slab you placed keeps only the part that sits on the tower, so every mistake makes the tower narrower for good.
4. If a slab lands within 0.3 units of the slab below (the first slab is 10 units wide), it snaps on exactly and keeps its full width. The game marks it with a ring of light and the word PERFECT.
5. Press P or Esc to pause, M to switch the sounds off. The game also pauses when you leave the tab.

How fast it gets

The first slab you drop needs about 3.7 seconds for one full pass over the tower. By the ninth drop a pass takes 2.7 seconds, by the nineteenth 2.0 and by the twenty-ninth 1.6. The speed never stops rising, so a tower of 30 slabs asks for much sharper timing than the first five.

What you see on screen

• Top centre: the number of slabs placed, with your highest tower underneath.
• Dashed line: the height of your highest tower, so you can see how close the current one is.
• Sky and colours: every slab shifts the hue a little; the sky moves from dusk to night as you climb.
• Result card: slabs stacked, perfect drops, your longest run of perfect drops and the time you played.

Frequently asked questions

Does the tower ever get wider again?

No. A slab never grows. A perfect drop keeps the width you have; a cut removes exactly the overhang.

Does the game keep my highest tower?

Yes, in your browser. Clearing site data removes it.

Can I play on a phone?

Yes. A tap anywhere on the screen drops the slab.

Does it have sound?

Short effects for drops, perfect hits, cut-offs and the end of a run. Press M or the speaker button to turn them off.

Is Slabspire free to play?

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