A Short Hike, Anodyne 2: Return To Dust, and Mutazione are free for a limited time on the Epic Games Store. These games normally cost €6.59, €16.79, and €17.99 but for the next seven days you can get them for free. The offer ends on Thursday, March 19.
To get the games, just go to the Short Hike, Anodyne 2: Return To Dust, and Mutazione pages on the Epic Games Store, and click the "GET" button. Once you get the games, they will be yours forever.