When I think of the best puzzle games, a striking art style goes a long way. Return of the Obra Dinn, The Witness, Antichamber, The Swapper - even the likes of Outer Wilds. Its not a must-have, but it can turn a great experience into a truly memorable one. Particle Hearts has got the goods. This gorgeous blend of contemplation, intrigue, and exploration takes place in a world made entirely of particles, which you must manipulate in order to proceed. If its slipped under your radar, weve got good news in the form of dozens of free Steam keys that were giving away.Read the full story on PCGamesN: Grab a free Steam key for stunning, atmospheric puzzler Particle Hearts