@enum OBJECT begin
    INVALID_OBJ = -1
    INVALID_IDX = -2
    PLAYER = 0
    SPACE = 100
    WALL_OBJ = 51
    EXIT_OBJ = 52
    AGENT_OBJ = 53
    EXPLOSION = 54
    EXPLOSION2 = 55
    EXPLOSION3 =56
    EXPLOSION4= 57
    EXPLOSION5 = 58
    TRAIL = 59
    DOOR_OBJ = 200
    KEY_OBJ = 300
end