The Talos Principle by Devolver Digital and Croteam is free to download for a limited time at Epic Store.
The Talos Principle is a first-person puzzle game from Croteam (Serious Sam) and written by Tom Jubert (FTL, The Swapper) and Jonas Kyratzes (Infinite Ocean). Solve complex puzzles woven into a metaphysical parable about intelligence and meaning in a doomed world. Tasked by your creator with solving a series of increasingly complex puzzles, you must decide whether to have faith or to ask the difficult questions: Who are you? What is your purpose? And what are you going to do about it?