Something ancient stirs beneath the keep of Grimstone. Centuries ago,
the wardens sealed the Abyss — a sprawling labyrinth where the damned
were sent to be forgotten. Now the seal is broken, and the depths are
waking. From the slime-lit Crypts to the molten Infernal Foundry, the
legions of the deep are clawing their way toward the surface, and only
one soul is foolish enough — or desperate enough — to go down after them.

You are that soul. Armed at first with nothing but a service pistol,
you will fight through eight distinct areas: the bone-stacked Crypts,
the flooded Sewers, the machine-hall Iron Fortress, the infamous Temple
of Blood, the obsidian throne of The Herald himself, the ice-slick
Frozen Vaults, the pitch-black Catacombs where a lantern is worth more
than a gun, and finally the Foundry — the burning court of Abaddon,
the last lord of the Abyss.

This is old-school shooting the way you remember it: fast, loud and
fair. Hunt silver and gold keys to unseal the deeper halls, slam
treasure goblets and chalices into your pockets, and keep one eye on
the walls — many of them hide secret rooms stuffed with ammo, armor
and riches. Lava burns. Poison pools sizzle. Deep water drags at your
boots. And when the Mega Orb hums in its alcove, you'll feel
invincible… right up until the next volley of fireballs.

Between runs, the Abyss remembers you: three difficulty settings, a
continue system that restarts you at the deepest level you reached,
and a best score that only the truly worthy will beat.