extern bool earthquake_aux(POSITION cy, POSITION cx, POSITION r, MONSTER_IDX m_idx);
extern bool earthquake(POSITION cy, POSITION cx, POSITION r);
extern void lite_room(POSITION y1, POSITION x1);
extern bool earthquake_aux(POSITION cy, POSITION cx, POSITION r, MONSTER_IDX m_idx);
extern bool earthquake(POSITION cy, POSITION cx, POSITION r);
extern void lite_room(POSITION y1, POSITION x1);