Thanks to Anon for the following.
The man behind the curtain, season 3
The Variable, season 5
Swingset in TMBTC in season 3 in Dharmaville is totally different than swingset in Variable. In Variable swingset has visible chains, in TMBTC chains are covered with plastics and smaller. Seats are also different - in Variable they are wooden - in TMBTC they were made of plastics and rounded.