Metro tunnel boring machine simulator — drive the shield, balance the face, build the ring, protect the city.
You are the pilot of a 6.6 m earth-pressure-balance TBM. Keep the chamber pressure matched to the ground, steer the articulation jacks along the design line, extract muck, erect precast lining rings and fill the tail void with grout — while the monitored buildings above must not settle.
Each ring: push forward 1.5 m, stop, erect 7 lining segments, dispatch the muck train, repeat until you break into the next station.
Face pressure must stay inside the green band: too low and the face loses ground (settlement, inrush); too high and you blow out. Chamber pressure rises when you cut faster than the screw extracts, and falls when it extracts faster. Torque above the limit stalls the cutterhead. Fill the tail void with grout during the drive. Assists make the game easier but reduce your score multiplier.
Machine holding position.
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