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Hosted by Mel Giedroyc and back for a second series, Letterbox is the gameshow where pairs of contestants go head to head to crack a series of passwords, in an attempt to take home 拢2,500 in cash.

As the contestants solve the passwords, they win letters that help them later in the game. These letters will better their chances of cracking the final password which unlocks the Letterbox holding the cash prize. But, if they end up as the losing pair along the way, they have to surrender all the letters that they have won to the winning pair, who will then go through to the semi-final.