Ben Shephard hosts as comedian Joe Lycett, Pussycat Doll Melody Thornton and retired cricket commentator Henry Blofeld take part in the game show, in which they must answer questions to win turns on an arcade-style machine. Dropping counters down a choice of four chutes, they hope to knock piles of them off a moving shelf - with the highest scorer playing for the £20,000 jackpot for their chosen charity.

Comedian Alex Brooker, Emmerdale actor Chris Bisson and reality star Joey Essex will need to keep cool under pressure if they're to master the machine.