Siltline

Falling sand puzzle
1 player
Phones and computers

Siltline is a falling sand puzzle that plays in the browser on phones, tablets and computers, for one player.

Blocks of coloured silt break into grains in a 48-by-80 tank, and a colour joining wall to wall washes away. Each block is 36 grains, which link a colour only side to side or top to bottom, never at a corner. Every 1,500 grains washed away speeds the fall, a fifth colour joins at 2,000, and sand reaching the top ends play.

Play Siltline

How to play

Move and turn the piece with the arrows. It crumbles into sand when it landsOn a touch screen: Drag to move, tap to turn. It crumbles into sand when it lands
Join one colour from the left wall to the right wall to wash it away
Once per piece, a gust (Q or E) blows the top grains sidewaysOn a touch screen: Once per piece, a gust button blows the top grains sideways

The game shows these steps as you play, the first time.

Controls

Left/Right move, Up or X turns, Down falls faster, Space drops, Q and E gust
Touch: drag to move, tap to turn, flick down to drop, gust buttons

Tips

A gust moves only the top grain of each column by up to two cells; it closes a small gap in a band, not a pile.
Grains join only side to side or top to bottom, so patches meeting at a corner stay separate, while a winding band joined all the way still washes.
Speed steps up by 2 cells a second for every 1,500 grains washed, from 6 to a cap of 24, so the ninth step at 13,500 grains is the last.

What exactly counts as wall to wall?

A single colour whose grains touch, side by side or one above another, in an unbroken path from the left wall to the right wall. Corner-only contact does not join. When that holds, the whole connected patch of that colour washes away, not just the thinnest line, and the sand above drops down.

When can I use the gust?

Once for every piece. Q blows left and E blows right, or use the two on-screen buttons on touch, and the panel shows Gust ready or Gust used. The gust is set ready again every time a piece lands and crumbles, so an unused gust does not carry over as a second one.

About this game

Made by Sucia in Houston, Texas. Built with AI assistance, designed and tested by Sucia. Last updated October 7, 2026. It plays in the browser on phones, tablets and computers, with no download and no sign-in; your best scores and progress stay in this browser on this device. Without a pass, every game is free for 5 minutes a game and 30 minutes a day; an Arcade pass removes the limit. How Sucia makes and tests its games.

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