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8420: Current room number
Initialised to 0x21 (The Bathroom) by the routine at 87CA, checked by the routines at 8912, 91BE, 93D1, 9534, 9584, 959A and 9637, and updated by the routines at 8B07, 948A, 949E, 94B0 and 94D2.
8420 DEFB $00
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