Sandtris

What is Sandtris?

Sandtris is a falling-block puzzle with a sand simulation underneath it. The shapes look solid while they fall, but break into grains on landing. Those grains slide down slopes, fill gaps and mix with the layers already on the board.

Your aim is to connect sand of the same color from one side of the playfield to the other. That connection clears space. The challenge is judging where a piece will spread after it lands, rather than treating its outline as a permanent shape.

How do you clear lines in Sandtris?

Build a connected path of one color across the full width of the board. You are not trying to fill a straight row of solid blocks. A sloping band of matching sand can do the job.

Watch the colors exposed along the surface before placing the next piece. Adding more of a color near an existing patch can help extend it; burying that patch under another color can make the connection harder. The next-piece preview gives you a little room to plan, but the sand keeps the result from feeling entirely predictable.

How do the computer controls work?

Use the left and right arrow keys to move the falling piece, the up arrow to rotate it and the down arrow to make it fall faster. The instructions also list Shift or Ctrl for faster sideways movement.

Press P to pause. The pause menu lets you resume or choose New Game, and has separate music and sound-effect sliders. You can stop and think without leaving the page.

Can you play Sandtris on a phone?

Yes. The touch controls work for moving and rotating pieces, and the game plays well on a phone. A computer gives you arrow-key controls and more space to read the layers of sand.

No download or account is needed to start a game. There is a weekly leaderboard alongside the playfield, but you can simply play for your own score.

What should you know before playing?

The page displays ads beside the game. Use the Start button inside the Sandtris play area; surrounding ads are separate from the game.

Color matching is central to play, and the sand grains are small. It may be a poor fit if distinguishing those colors is difficult. Sound has its own controls, so you can adjust the music and effects separately.

The creator credits Setris as an inspiration and states that Sandtris is not affiliated with Tetris.

What we like about Sandtris

The satisfying part is watching a tidy shape fall apart and become part of an untidy landscape. During our desktop play, grains slid down the pile instead of staying in the shape we had rotated. That changes what looks like a familiar placement decision.

It has a clear goal without losing the appeal of a physics toy. You can enjoy the little cascades immediately, then start paying attention to how the colored layers connect. The ads are the main distraction outside the game itself.