Several games will offer limited DLC, and a Steam sale will be held, all to support the Armistice fundraising initiative from charities War Child and Children in Conflict.
Held to coincide with the 100th anniversary of the end of World War 1 on November 11, Armistice aims to encourage peaceful gameplay, and raise money for the anti-war charities.
Steam is offering a selection of (extremely good) games for up to 75% off this week, with a percentage of the proceeds going to charity.
Several games will also offer Armistice DLC or promotions. Aardman-animated World War 1 game, 11-11: Memories Retold will offer a £2.99 DLC pack featuring actress Carey Mulligan, with all proceeds going to War Child.
World of Tanks will hold a commemorative laying down of arms and offer limited skins and emblems, while the likes of VR game Dick Wilde, Prison Architect, Shadowgun Legends and more will offer fundraising options.
JustGiving LiveStreaming will also let streamers integrate JustGiving donation pages into their streams.
Since beginning in 2016, Armistice has raised over $390,000, with proceeds going to children affected by war across the world.
You can read much more about the campaign, and excatly how you can donate this year, on the Armistice website.