Platform game Celeste and puzzle-platformer Inside are both free for a limited time on the Epic Games Store. These games normally cost 15.99 euro but for the next seven days you can get them for free. The offer ends on Thursday, September 5.
To get the games, just go to the Celeste and Inside pages on the Epic Games Store, and click the "GET" button. Once you get the games, they will be yours forever.