Epic Games, Orcs Must Die! 3 will offer you the game completely free of charge according to the billbil-kun, which has a reliable profile and leaks many games in advance. You can add the game to your library between 2 and 9 May and have it permanently.
On the other hand, you can access Industria and Lisa: The Painful Definitive Edition games from 18:00 to 18:00 and add it to your library completely free. These games will be valid until May 2.
On the other hand, you can add The Big Con and Town of Salem 2 games to your library for free.