Owain Williams
Boomerang and Cube for S4C, 12 September 2012 to 28 August 2013 (38 episodes in 1 series)
A team of three children try to ascend a tower block. On their way, they'll face challenges - some to be competed as a team, some faced by individual players, and failure will cost the team. Not everyone will make it to the top floor and share in the prize.
Via the magic of website technology, viewers at home are able to play the same games as the contestants on screen. The best home players over the series win prizes.
The programme's title translates as "The Lift". See, our Welsh isn't that bad.
Official website, including a play-along game.
Ludus, which re-used some of the challenges from Y Lifft.