What Sigma Impact is
Sigma Impact is a physics-based 2D action roguelite played from a top-down view inside a dungeon made of glass. Combat leans on momentum and positioning rather than simple button mashing: swinging a weapon with weight behind it changes how much damage it lands. Each run takes you room by room toward a final boss, with procedurally generated layouts so the path shifts each time. Rooms are cleared in sequence, and you unlock weapons and perks as you go.
The arsenal covers eight weapons with different roles. The Hammer rewards timing on charged impacts, the Mace can be swung for explosions or thrown like a grenade, and the Spike fires explosive bullets where landing a bullseye scores extra damage. The Jet Hammer spins with jet engines for remote-controlled charges, the Yoyo can be flung out with controlled speed, the Lance does precise thrusts plus charged lasers, the Claw works as a shield shape for bashing and blocking, and the Hexagon stuns, heals, and fires flashbangs at range. There is a training room for testing a weapon before taking it into a run.
Playing it with a group
Sigma Impact supports local multiplayer, with co-op and player-versus-player modes. In co-op you and a friend work through the glass dungeon together; in PvP you fight each other directly. The game also lists Remote Play Together as a Steam feature, which lets people join over a network as if they were sitting locally.
Since this is local play, plan for shared hardware: controllers work with the game, so a group can set up in one room and rotate through matches or runs. Score attack and leaderboards push toward replaying runs for higher numbers, which gives a group something concrete to compare after each attempt.
Before you start
Expect a steep learning curve. Physics-driven swinging takes practice, and the controls feel awkward until the timing clicks, so a session in the training room before a real run saves frustration. The run structure is linear: you move through rooms toward the boss rather than exploring freely.
Runs are short, and the overall package is on the shorter side with a limited set of levels, enemies, and weapons. The adaptive soundtrack reacts to your play in real time, so audio shifts with the action rather than looping on a fixed track. Going in, the useful mindset is that mastery comes from repeated runs — unlocking more modes and weapons as your control of the physics improves.