Soma Stack

Drop the seven classic cube pieces into a target solid, working with gravity instead of against it — nothing floats.

How to play

You have seven small interlocking pieces made of cubes and a ghosted target shape to fill. Select a piece, rotate it to the orientation you want, then drop it into a column. The piece falls and must come to rest on the floor or on another piece — so the order you stack in matters. Fill the whole shape to win.

• Pick a piece, rotate it, then click a target column to drop it
• Every piece is pulled down by gravity and must be supported
• Remove a misplaced piece or undo to back out of a dead end
• Blind mode hides interior cells for an extra mental challenge

Controls

• Desktop: click a tray piece to select, press R or the Rotate button to turn it, click a column to drop, right-click a placed piece to remove it, U to undo. Mouse recommended.
• Phone & tablet: tap to select, tap Rotate and Undo buttons, tap a column to drop — the on-screen buttons keep it playable by touch.

Game modes

• Daily: one shared seeded shape per day
• Practice: endless fresh shapes, with an optional Blind toggle

Tips & strategy

• Plan from the bottom up — a piece can only sit where something already holds it
• Save the awkward L and branching pieces for gaps their shape uniquely fits
• Faster solves and blind clears score more, so undo freely while learning a shape

What you'll learn

Soma Stack is a take on the seven-piece cube-dissection puzzle, with a gravity rule that adds a fresh challenge.

• Skills: spatial reasoning, 3D assembly, mental rotation
• Best for: roughly grades 5–12 (ages 10+)
• For parents & teachers: classic 3D dissection, with a twist.

About Soma Stack

Soma Stack is an original free browser take on the classic seven-piece cube-dissection puzzle, with a gravity rule that turns assembly into a stacking-order challenge. Built in-house for PlayPendium.

A free, original browser game on PlayPendium — no download, no install. Browse all games →