If you’re a fan of mind-bending puzzlers like Portal 2, Antichamber, and The Witness, then the QUBE games are a must-play. Setting you on a series of increasingly complex puzzle rooms in the style of Valve’s Portal games, QUBE and QUBE 2 are two of the most satisfying games I’ve played, and something I’ll recommend as a must-play for any Portal fans out there. Fortunately, you can get both as free PC games right now – so don’t hesitate.