Strata

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0 mSurface 0coins 0/8bag 0/4power

Workshop

Each layer of rock needs a harder pick than the one above it.

Admin

Nothing here leaves this device.

Planet 2

Vitrio

Saved.

Strata

Cut tunnels down through four layers of rock, carry the ore up to sell, and buy the tools that break the next layer. Deep in the bottom layer, alien machinery waits to be switched on.

How to play

Tap rock beside your tunnel to swing your pick. A few swings break a tile, and any ore in it goes into your bag.
You can only swing at rock that faces a tunnel you can reach, up to three tiles away.
When the bag is full, press the walk-up button. The miner walks back along your tunnels and sells at the stall.
Spend your coins in the Workshop, then press the button again to walk back down.

With a full bag, rock still breaks but new ore stays in the ground.

Layers

Each layer needs a harder pick, or your swing skids off.

Topsoil (1 to 24 m): the Steel Pick you start with.
Sandstone (25 to 72 m): the Iron-Shod Pick.
Basalt (73 to 144 m): the Carbide Pick.
Granite (145 m down): the Diamond Pick.

Upgrades

The Workshop has nine lines. Pick, Bore and Swing make you dig harder and faster. Bag, Rig and Lamp let you carry more, walk faster and see further. Drones and Drone bays dig and haul for you, and Loupe gets better prices. Drones dig and sell on their own, and Drone bays let each carry more. Drones keep earning for up to six hours while the game is closed.

The alien tech

An orb of alien metal lies in the granite, and four switches are buried 50 to 75 metres from it. A cable links each switch to the orb, so cross one and follow it. Stand against a switch to throw it. With all four on, the orb opens. Walk into its centre to reach a new planet, with harder rock, richer ore and all your tools.

Controls

Mouse / touch: tap rock to swing, and hold to keep swinging. Tap open tunnel to walk there. Drag to look around.
Keyboard: W A S D or the arrow keys dig or walk that way. Space or Enter walks up or back down. E or Tab opens the Workshop, and Esc closes it.

Scoring

The leaderboard ranks depth, highest first. Your score is your deepest metre on this planet, plus 240 for each planet left behind. It is sent whenever you sell.

Tips

Dig sideways as well as down. Ore is spread across the whole map.
An early Lamp shows the ore you would otherwise dig past.
From the basalt down, read the note under the buttons. It hints where the alien tech lies.