Gemstack

A 3D block-stacking dig

A falling-block puzzle set in a mine shaft you look down into. Gem pieces drop into a 5×5 shaft sixteen layers deep. Fill a complete layer and it shatters into coins. Clear enough layers to finish the level, then spend your coins in the Mole's shop before you dig deeper.

How it plays

• Move, spin, tip and roll each piece in full 3D, and turn the shaft to see it from any side.
• Every layer has its own gem colour, from violet at the bottom to red at the top, so you can judge depth at a glance.
• A see-through ghost shows where your piece will land, and the piece casts a shadow straight down the shaft.
• A layer meter shows how full each layer is and which one your piece is heading for.
• The first five levels keep a slow, steady pace while you learn the feel. From level 6, pieces fall a little faster every level.
• Each level starts with gappy rubble at the bottom to plug, and 3D pieces that span two layers join from level 3.

Earning coins

• Clear 1, 2, 3 or 4 layers at once for 10, 25, 45 or 70 coins.
• Back-to-back clears build a combo worth extra coins.
• Rubble layers and gold gems pay a bonus.
• Empty the shaft completely for a +50 Spotless bonus.
• Finishing a level pays a bonus that grows the deeper you go.

The Mole's shop

Power-ups to use during a level:

• Pebble: swap the falling piece for a single cube that plugs any hole.
• Blast gem: turn the piece into a bomb that blows a 3×3×3 hole where it lands.
• Top shave: clear the highest layer instantly.
• Hourglass: pieces fall at half speed for 30 seconds.
• Safety net: if the stack reaches the top, the top 4 layers crumble instead of ending your run.

Permanent upgrades:

• Hold pocket: stash a piece and swap it back later.
• Far sight: see more upcoming pieces.
• Gold rush: every cleared layer pays more.
• Lucky veins: some pieces carry gold gems worth extra coins.
• Steady hands: more time before a piece locks in place.