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A single-player casual game. You play as Sandbox characters, parkour and idle.
Price history tracked since Jul 7, 2026 · vs all tracked offers.
Based solely on tracked price history — not purchase advice.
Tracked since Jul 7, 2026.
Steam Social Deduction Fest ends
Official stores with direct support.
Try this game before buying.
Unserious Sandbox is a single-player casual game with some unserious parkour.
Traversal is a skill-based movement game, like CS's KZ, Surf, or Minecraft parkour. The core mechanics of traversal is about using as little movement input as possible.
Play with ragdoll physics in sandbox maps. Embrace the chaos and master the art of falling flat...
One day, a Sandbox learned two words: Unseriverse, Susbicious. Then, the Sandbox became unserious and began parkour.
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