Multiple leading developers will be donating all money generated by microtransactions to charity for the next two weeks.
The initiative is part of the Apps for Red drive, which is supporting Product Red, the organisation founded by U2 vocalist Bono and activist Bobby Shriver. The money raised will go to the Global Fund fighting HIV, AIDS, tuberculosis and malaria in Africa.
The games involved include Angry Birds, Bubble Witch 2 Saga, Clash of Clans, CSR Racing, Cut the Rope 2, Despicable Me: Minion Rush, Farmville 2: Country Escape, FIFA 15: Ultimate Team, Kim Kardashian: Hollywood, Monument Valley, Puzzle & Dragons and Threes.
Develop has more information.