The current implementations (as of protocol version &protonum;) use the following opcode values to identify messages: OP_CHEAT = 0 OP_MAP = 2 OP_RULES = 3 OP_STATE = 4 OP_MOVE = 5 OP_ACTION = 6 MOVE_PLAYER = 0 MOVE_MONSTER = 1 MOVE_UP = 0 MOVE_DOWN = 1 MOVE_LEFT = 2 MOVE_RIGHT = 3 STATE_START = 0 STATE_STOP = 1 MAP_SELECT = 0 MAP_SELECTED = 1 ACTION_NEWPLAYER = 0 ACTION_NEWMONSTER = 1 ACTION_NEWITEM = 2 ACTION_NEWEXIT = 3 ACTION_NEWBLAST = 4 ACTION_NEWBOMB = 5 ACTION_ITEM = 6 ACTION_REMOVEPLAYER = 7 ACTION_REMOVEMONSTER = 8 ACTION_REMOVEITEM = 9 ACTION_REMOVEBOMB = 10 ACTION_REMOVEBLAST = 11 ACTION_ACTIVATEITEM = 12 ACTION_ACTIVATEEXIT = 13 ACTION_HIGHLIGHTITEM = 14 ACTION_HIGHLIGHTEXIT = 15