Series
Some of these games are chapters. You can start at any of them — the running jokes are a reward for reading in order, never a requirement.
Vacuum Quest
Somebody has to clean it up.
Rex Ractor keeps getting promoted into larger and larger versions of the mess he already understands. The escalation is in scale, never in Rex — he does not become a hero, learn to fight, or acquire a destiny. He gets a slightly better mop and a slightly worse job title. Each chapter stands alone; the running threads are rewards for continuity, never prerequisites.
1 Sanitation ProtocolYou are the night janitor on a research station that has begun making its own decisions.
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