A 40-second TV ad, which debuts next Monday and will run throughout March, features the Central Beacons Mountain Rescue Team on exercise. The team promotes and explains how to play Camelot's new game, called Lotto HotPicks.
The spot could be one of up to 20 charity-themed commercials to run this year. The first ad in the campaign launched last month and featured the charity Seeds of Hope.
Jo Kenrick, the director of marketing communications at Camelot, said: "We want to show real examples of some of the many projects that benefit from the £24 million raised each week by the National Lottery for good causes."
The ad was written by Mick French and art directed by Henry Rossiter.
It was directed by Ron Scalpello at BBC Creative Services. Planning was handled by Media Planning Group, with buying by OMD.