Rover

is the name of a mysterious round creature with dog-like behavior that appears as a recurring LA: in. To attack, it barks and pick up a heavy LA: to throw it at LA: in an effort to incapacitate him. LA: must reach the LA: before the LA: can and throw it back at LA: with his LA:, slamming the creature into submission.

LA: is found in a hidden room in LA:, in one of the "eyes" on the LA: map. The only way to access this room is to open the wall with NaN Bombs. After defeating LA:, a warp to the entrance of the LA: will appear and LA: can pass through to a room that contains a secret passageway deeper into the LA:. However, if he cannot find the passageway, the rooms will loop endlessly. LA: later appears in LA: along with other NaN Sub-Bosss, where it will continue to reappear even after being destroyed.

OoA: is found as the OoA: in the OoA: on OoA:. The only major difference from its incarnation is that the OoA: will disappear after a short while after being thrown and reappear elsewhere.