左右（もしくは上下）に往復する。 プレイヤー操作で移動やスピード変化が起こるメカニクスと組み合わせる。
weapon: explosion weapon: interference player: reciprocate on holding: defenseless weapon: vertical
player: reciprocate on holding: move
weapon: artillery player: reciprocate on holding: adjust angle on released: throw
on holding: defend rule: friendly fire player: reciprocate on pressed: turn
on holding: inhale obstacle: penalty rule: physics player: reciprocate obstacle: well up
