Shadow Tactics, which is a stealth and strategy game, is currently free on Epic Games, until the 29th December at 16:00 GMT.
Description:
Shadow Tactics is a hardcore tactical stealth game set in Japan around the Edo period. A new Shogun seizes power over Japan and enforces nationwide peace. He recruits five specialists with extraordinary skills for assassination, sabotage and espionage.
Link:
https://www.epicgames.com/store/en-US/product/shadow-tactics/home