The Bob-omb Elevator is a basic trick used in Super Mario Maker that allows Mario to gain height by riding a Bob-omb upwards.
How It Works
When Mario Spin Jumps on a Bob-omb it will be sent flying in the opposite direction. By constantly rebounding the Bob-omb off sideways springs it is possible to slowly gain height.
Basic Bob-omb Elevator
When Mario is Big Mario he has the ability to kick a Bob-omb forward without having to Spin Jump.
By having two walls made of sideways spring it is possible to kick the Bob-omb the opposite direction and still gain height.
When Yoshi jumps on a Bob-omb it will have the same effect as a Spin Jump.