Hypersomnia
Open-source multiplayer top-down shooter with an in-game map editor
1.6k stars 102 forks last commit first released AGPL-3.0
Actively maintained
Last commit 21 Jun 2026.
Hypersomnia is a community-driven multiplayer top-down shooter built from scratch in modern C++ without using a game engine. It supports native desktop clients and a browser version, aiming for fast competitive matches and easy community content creation.
Key Features
- Multiplayer top-down shooter gameplay with multiple game modes
- Deterministic networking model that transmits player inputs to stay in sync across platforms (including browser and native clients)
- In-game map editor for creating and playtesting arenas with friends
- Cross-platform support for Windows, Linux, and macOS, with a web-playable client available
- Built-from-scratch tech stack (rendering, simulation, and networking) focused on performance and control
Use Cases
- Host community game nights or competitive matches on your own server
- Create and iterate on custom maps for private events or public play
- Learn from and extend a full C++ multiplayer game codebase (engine-less approach)
Hypersomnia is a strong fit for communities that want an open-source shooter they can run themselves, as well as developers interested in deterministic multiplayer simulation and tooling like integrated editors.
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