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If you’ve been curious about Core Keeper, this weekend is the perfect excuse to dig in.

The award-winning mining sandbox adventure from Pugstorm and Fireshine Games is free to play on Steam through Monday, October 12 at 10 a.m. PT. And yes, you get the full game, including its post-launch content updates.

You can head underground solo or bring along 2–8 players for drop-in, drop-out online co-op. The latest Riders of the Underground update also adds rideable mounts and a new Hookshot, giving players even more ways to explore the sprawling underground world.

There’s plenty to keep you busy: mine for resources, build your base, grow crops, fish, craft gear, discover strange creatures and take on powerful Titans. With more than 6 million players already having entered the caverns, there’s clearly something down there worth finding.

Best of all, your progress isn’t lost when the free weekend ends. Buy the game on Steam and you can pick up right where you left off.

So grab some friends, fire up Steam and start digging. Just remember: you never really know what’s waiting around the next corner.

Core Keeper is free on Steam until Monday, October 12 at 10 a.m. PT.