Obsidian's Honey I Shrunk The Kids 'em up survival sandbox Grounded is adding an actual sandbox this month, along with its first dungeon, and a big old pile of trash. This all arrives in the Hot and Hazy update on October 20th, which will give players new places to explore and new creepy crawlies to fight. It's also revamping an existing biome, and you can try it all out right now on a test branch if you fancy.
