The Riftbreaker: Prologue follows Captain Ashley S. Nowak, an elite scientist and commando who travels through a one-way portal to Galatea 37 in her powerful Mecha-Suit, Mr. Riggs. Her larger mission is to establish a base that can support a route back to Earth. As a prologue, the game presents events before the main game's story campaign, pairing that setup with a choice between pursuing its objectives and taking a more open-ended approach to the planet.
Progress depends on turning exploration into infrastructure. Ashley gathers resources and specimens, then builds interconnected mines, refineries, power plants, and research facilities toward the goal of constructing a two-way rift. Galatea 37's varied biomes offer resources and unfamiliar wildlife, while local outposts can transport materials through rift technology. Research unlocks technologies and blueprints; crafting lets players create and improve Mr. Riggs's equipment, weapons, and parts.
Expansion also makes the base a target. As industry disrupts the planet's natural order, hostile creatures launch increasingly strong attacks, giving walls, barriers, and defense towers a central role alongside Mr. Riggs's combat abilities. The result is a strategy-and-action premise in which developing the operation and surviving its consequences are closely linked.
