Serious Sam developer Croteam's philosophical first-person puzzler The Talos Principle has a free public test for players to "test the range of puzzle mechanics, as well as run a benchmarking AI bot for their PC."

The test will consist of "four increasingly difficult complete puzzle levels" which will give players an understanding of exactly how the game works while also performing some beta testing before release. You can gain access to the public test on the game's Steam page.

The Talos Principle will release on December 11 fir PC, Mac, and Linux with PlayStation 4 and Android versions set for 2015.