Mario vs Donkey Kong

Over here the conveyor switch will now also control the elevators. Leave the Key and jump off the trampoline. Hit the Switch and take the next elevator going up. Jump onto the platform and go off the trampoline. From here climb the ropes up and avoid the bats. Jump from vine to vine towards the Red Prize. There is nothing else near the vines, just bats. Keep going right and slide down one of last vines. Go all the way down to hit the Blue Switch, ride the conveyor through the gap and grab the Key. Jump off the trampoline and hit the Switch. Throw the Key onto the conveyor and go with it to the otherside. Take the two elevators up with the Key. The door isn't blocked by the red blocks anymore, so just open it.