The old-timers all tell you the same thing: the mine under your land
is empty, and grandpa's drill pod is junk. They're wrong on both
counts. Beneath the topsoil waits a vertical world no one has ever
finished exploring - stone galleries, frozen caverns, a drowned
temple, molten forges, and places so far down they glow a color that
has no name.

Every shift, the surface office posts a cash quota and a countdown.
Pilot your pod down, chew through dirt and rock, and crack open
coal, copper, emeralds, rubies, ancient relics and far stranger
things. But treasure isn't money until you sell it: your cargo hold
fills up fast, and only the surface pays. Fill the hold, climb back
up, cash out, beat the quota - then gamble every coin at the shop on
a faster drill, a bigger cargo bay, heavier hull plating, TNT racks,
cargo magnets, energy shields and a chrono core that bends time
itself.

Because the deep bites back. Gas pockets erupt, lava burns, cursed
skulls hex your clock, and mimic chests pose as treasure until you
touch them. Chain treasures back-to-back for combo multipliers up to
x4, survive wild shifts like Blackout, Earthquake and Midas Vein,
and when you finally beat the Starforge Core, the Bottomless Shaft
opens - an endless dig where the only score that matters is how deep
you fall before the dark takes its cut. And don't worry about
stopping: your dig saves itself, so the title screen will drop you
exactly where you left off - world, cargo, upgrades and all.