Sigma Impact is a Action game from John Bishop with a 97% positive Steam review signal. Indie Lantern indexes it for players browsing by single-player, co-op.

Game snapshot
- Developer
- John Bishop
- Release year
- 2021
- Playtime
- Varies by player
- Price
- $4.99
- Review signal
- 97% positive
Screenshots






System requirements
PC
- Minimum
- OS *: Windows 7, 8 or 10 x64
Processor: Intel or AMD Dual Core CPU
Memory: 512 MB RAM
Graphics: (Integrated): Intel HD Graphics or AMD (formerly ATI) Radeon HD Graphics (Discrete): Nvidia GeForce 9600 GT or AMD Radeon HD 2400
DirectX: Version 9.0
Storage: 64 MB available space
From Steam reviews
Review notes
Sigma Impact is worth a closer look if you want high skill ceiling, controller friendly, great with friends, and replayable.
Best for players who want emotional story, high skill ceiling, controller friendly, and great with friends.
Check more carefully if you dislike repetition or grind.
high-skill-ceiling
FitThe game rewards practice and mastery over time.
controller-friendly
FitController, gamepad, or Steam Deck play comes up as a plus.
great-with-friends
FitIt tends to be better when shared with friends.
replayable
FitThe structure gives reasons to return rather than finish once.
emotional-story
ToneThe story is framed as affecting rather than just plot-heavy.
rhythm
Play styleTiming actions to music or rhythm is part of the hook.
grindy
FrictionThe loop may feel repetitive if you dislike grind.
Steam review snapshots
Sigma Impact is a physics-based 2d side-scrolling action roguelite with 2-player coop and pvp modes.[b] THE TRUE SIGMA GRIND.Sigma Impact is easy to learn, but hard to master.Definitely worth the price, the basic controls are simple but there's an elegance to figuring out the right rhythm for combat, with…Why it fits
Check it if you want action filtered by single-player, co-op.
Who might skip it
Research further on Steam if you need verified accessibility details, exact playtime, or current system requirements.