Steamストアで無料配布

Galactic Civilizations® II: Ultimate Edition (日本時間で5月28日02時頃まで)
https://store.steampowered.com/app/202200/Galactic_Civilizations_II_Ultimate_Edition/

Guns of Icarus Alliance (日本時間で5月30日02時頃まで)
https://store.steampowered.com/app/608800/Guns_of_Icarus_Alliance/