Out if the robot's far edge after this turn's move -- U plus the step plus his half-size -- is below the wall at 128 less the room's U half-size. U is then set to 0: not a position but a marker, which ADJUST_PLYR_UVZ_FOR_ROOM_SIZE sees when the next room is built and puts him in the doorway of its wall at high U. The other exits use $FF and 0 the same way. The new room is the one before in the same row: room numbers are a row in the high four bits and a column in the low four, and the column is changed on its own so that it wraps within the row.

EXIT_SCREEN is the way on for all four. It gives the legs the new room and starts the walk into it: 4 in bits 4-7 of +$0C, four turns of walking straight on with the controls and the walls ignored (Knight Lore's is three). For anything but the robot -- graphics 16 to 79 -- it returns, but only he gets here. For him the rest of the turn is abandoned: the returns into MOVE_PLAYER and to the legs' update are dropped, and both his records are copied to the start records (START_LEGS), so that a life lost in the new room starts again at this doorway. In the copies the graphic is moved to +$10 and replaced by 56, the first of the appearing robot's (PLAYER_APPEARING). Then the new room is built and the main loop starts over (AFTER_GAME).