> For the complete documentation index, see [llms.txt](https://little-orbit.gitbook.io/stfu/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://little-orbit.gitbook.io/stfu/ships-that-fight-underground/the-underground.md).
# The Underground
## Reinventing the genre
STFU is a complete re-imagining of the first-person ship shooter genre made popular in the 1990's. The original generation of games that made this genre used static ships with no progression. Instead, you entered a level and used power-ups and weapons you found to wipe out your opponents and complete obstacles.
Taking place primarily in T*he Underground* — a series of hollowed out twisting tunnels and bases in the asteroid belt, STFU has been designed from the ground up with addictive single and multiplayer battle modes, class-based combat featuring:
* 20 ships with different roles
* Stateful progression
* Upgradable skills trees
* Resource collection
* Crafting
* Player generated content