- OpenArena

- Chip's Challange and custom levels pack

- Freedoom+Blasmepher for Doom/Heretic

- LibreQuake

- Supertux2

- Oolite

- Kgoldminner/XScavenger with level sets

- Frozen Bubble

- Any X11/console/9front sokoban clone. Everyone reuses the same level set over and over.