P-switch

P-switches are objects that cause various effects to happen for a limited amount of time. Mario can hold them in all styles except Super Mario Bros. style.
 * All bricks turn into coins and all floating coins turn into bricks. If a coin from a P-switch is knocked down with a POW block, it will stay a coin after the P-switch expires.
 * Conveyor belts stop moving.
 * P-Doors will become solid and Mario can enter them.