Grab a free Steam key for stunning, atmospheric puzzler Particle Hearts

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. It's 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 it's slipped under your radar, we've got good news in the form of dozens of free Steam keys that we're giving away.

Straight out of the gate, Particle Hearts is one of the prettiest adventure games I've had the pleasure of looking at in quite some time. As mentioned, everything in the world is built of visible particles, from the sweeping environments to your character. As you explore its various biomes and gradually piece together your role in this strange land, you'll gain various abilities that enhance your ways to explore, alter the space around you, evade threats, and maybe even fight back.

Dissolve into individual particles to pass through gates, surf on winding light paths, transform into a beam that zips between pylons, or become a giant capable of smashing through your troubles. Regions also introduce their own individual mechanics that will force you to reconsider your approach, and you might find some creatures that are willing to help on your journey, if you take the time to befriend them.

I challenge you to watch the trailer above and not want the chance to discover the world Underwater Fire has built. Its environments are simply stunning, and the particle effect lands somewhere between the dot-matrix stylings of Obra Dinn and traditional 19th-Century Pointillism, ensuring something that's instantly recognizable and memorable. Much like the games I mentioned at the start, Particle Hearts is a game that begs to be explored - the smart mechanics simply elevate that process even further.

We've got 25 Particle Hearts Steam keys to give away for free, and all you have to do to be in with a chance of grabbing one is fill your details into the box below. The entry period is open from the time this article goes live, and will close on Friday September 19, 2025 at 4am PT / 7am ET / 12pm BST / 1pm CEST, so be sure to get your name in the hat by then.

PCGN - Particle Hearts giveaway

Want to make sure your time with Particle Hearts is as beautiful as possible? Here's our guide to the best gaming monitor in 2025. We've also rounded up all the best indie games on PC right now, so check you haven't been missing any hidden gems.

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