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simgrammar the grammar of simulation

core loop

build rooms from blueprints -> hire and train staff -> patients queue for GP diagnosis and referrals -> treatment cures or kills -> fees and reputation -> research new rooms and meet level goals

design notes

Theme Hospital turns medicine into routing. The GP and specialist diagnosis rooms raise a patient's diagnosis certainty, and the player sets the threshold at which treatment starts (it can be set above 100%), trading throughput against deaths from wrong cures. Rooms are fixed blueprints that need set furniture and, for some, specialist staff, so the staff roster and the floor plan gate each other. Machines that explode without a handyman, epidemics that can be covered up before the health inspector arrives, and timed emergencies add pressure on top of the queues. Much of the code came from Theme Park; CorsixTH is an open-source reimplementation with a level editor.

relations

17 stored edges
influenced by
uses

Diagnosis and treatment

A GP diagnoses or refers patients to specialist diagnosis rooms; treatment starts once certainty passes a player-set threshold, and diseases are fictional, such as Bloaty Head.

core
uses

Building placement

Rooms are placed as blueprints with doors and windows, then furnished with required items; many rooms must be researched first.

core
uses

Service queues

Patients queue outside each room; the player can rearrange queues, and long waits push patients to leave.

core
uses

Staff hiring and rosters

Doctors, nurses, handymen, and receptionists are hired with performance stats; some rooms need doctors with specialist skills.

core
uses
supporting
uses

Agent skills

Doctors can be trained to gain skills and specialisms.

supporting
uses

Contagion

Epidemics break out and can be covered up before a health inspector visits; failure brings fines and lost reputation.

supporting
uses

Contracts and orders

Emergencies require curing a group of patients within a time limit for a bonus.

supporting
uses
supporting
uses

Needs decay

Staff tire and need breaks under player-set break rules; patients need drinks and toilets.

supporting
uses

Reputation

Cures and deaths move a reputation that affects patient intake and level goals.

supporting
uses

Scenario objectives

Each level sets goals for money, reputation, cures, and hospital value; negative funds or too many deaths lose the level.

supporting
uses

Tech tree

Research unlocks rooms, drugs, and machine improvements.

supporting
uses

Wear and breakdown

Machines such as the Inflator need handyman servicing or they explode.

supporting

backlinks

computed from other records

sources

1
Wikipedia contributors (2026). Theme Hospital. Wikipedia

provenance

runs in log/runs
2026-10-24
created2026-10-24-catalog-gecatalog
2026-10-24
reviewed2026-10-24-review-fixesmaintenance