Barrier may be placed between any two players and stops weapons that affect adjacent bunnies. For example, the effects of a Nuclear Warhead may not reach your bunny if there is a Barrier between it and the target bunny in The Bunny Circle.
Barrier reverses the direction of Roaming Red Run cards (such as Cyber Bunny or Cruise Missile Prime). Barrier will cause any Roaming Run card to move in the opposite direction after it is reversed. Barrier does not stop any multi-target, non-Roaming Red Run card circumstances. More than one Barrier may be placed side by side between the same two players.
* See also Neutronium Barrier.