The third puzzle called the Teeters or TEE TERS can be solved by drawing a single bar that balances and equalises the two see saws and drawing another box to get the ball rolling.
This seems to be the simplest solution. So should we try to solve the puzzle by drawing the least number of stuffs? is tat the aim of the game? well tat would make the game boring and does not make the full use of the artistic power of Crayon Physics.