Hollow Ground

Hollow Ground is a top-down shooter built around classic 1990s shoot ’em up arcade games. Play solo or in local or online co-op with up to three friends, taking control of four mercenaries as they descend into the Epsilon 9 bunker. They must travel 40 floors to uncover its mystery, save the world and destroy the Machine, a biomechanical weapon of mass destruction that threatens extinction. This version was rebuilt from the ground up to play like the original 2003 Mac release.

Explore the bunker

The post-apocalyptic bunker contains more than 70 handcrafted labyrinthine levels, where you fight armies of mutated creatures and nefarious robots. Its tunnels contain machinery such as keycard doors, teleporters, switches and timers, and traversing each level is a perilous puzzle. The maps appear in a somewhat random order, so each attempt through the 40 floors is different.

Choose your mercenary

Each of the four mercenaries has four distinct weapons, along with individual strengths, weaknesses and synergies with cybernetic upgrades. Every character has eight slots for chips that can make them stronger, faster or better in other ways.

Spend credits

You find credits in the bunker and can spend them in shops that appear between levels. The shops offer medkits, weapon upgrades, single-use psionic abilities and cybernetic upgrades.

Race against radiation

Radioactivity steadily drains your health for every second you spend in the bunker. You may have to leave a floor early, even when treasure remains to be found.