The game has two seesaw inspectors, See and Saw, "testing" a seesaw by jumping on it. You control the inspector on the right side of the seesaw, as the other character jumps on the seesaw, sending you upwards. You need to stomp as you land on the seesaw, sending the other inspector flying upwards.
There are two main tempos in the song; jumping on the outer part of the seesaw, and jumping on the inner part. The inner part makes the inspectors go up a shorter distance than the outer part, making less time between stomps. The game will rapidly switch which part is being jumped on throughout the song. Partway though the song, some jumps will launch either of the inspectors far above the seesaw, then crash down. This has the same timing as the outer part jumping.