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