A devlog about building Sandbox Drive, a vehicle sandbox set on Hachijō-jima, a volcanic island in the Pacific rebuilt at full scale.https://sandbox-drive.digit.zone/enhttps://sandbox-drive.digit.zone/posts/september-2026-update/https://sandbox-drive.digit.zone/posts/september-2026-update/The helicopters got rebuilt, Hachijō-Fuji got a lava lake, the grass got a whole library of species, the engines finally sound like their layout, and the game moved back to an island it left in July.Fri, 25 Sep 2026 13:00:00 GMTupdatehelicoptershachijo-jimaaudiohttps://sandbox-drive.digit.zone/posts/bugs-that-taught-us-something/https://sandbox-drive.digit.zone/posts/bugs-that-taught-us-something/A rescue helicopter that fell 135 km, force feedback sent into the void, and a test suite that passed because it gave up halfway. The worst bugs in this project never crashed anything.Fri, 25 Sep 2026 12:50:00 GMTbehind-the-scenesbugshttps://sandbox-drive.digit.zone/posts/who-is-driving-multiplayer/https://sandbox-drive.digit.zone/posts/who-is-driving-multiplayer/In multiplayer, a car's physics runs on the machine of whoever is behind the wheel. What that means when two players swap seats, what the cars going past are actually doing, and the six weeks when nobody could hear them.Fri, 25 Sep 2026 12:40:00 GMTmultiplayerdeep-divehttps://sandbox-drive.digit.zone/posts/how-the-island-economy-works/https://sandbox-drive.digit.zone/posts/how-the-island-economy-works/There's no job list in Sandbox Drive. Every haul exists because something on the island ran out of something. How that works, how pay is calculated, why fuel gets cheaper when it's delivered, and the sawmill that threw away its own planks.Fri, 25 Sep 2026 12:30:00 GMTeconomydeep-divehachijo-jimahttps://sandbox-drive.digit.zone/posts/deep-dive-the-helicopter/https://sandbox-drive.digit.zone/posts/deep-dive-the-helicopter/The old helicopter flew on fake forces and aimed at the mouse cursor. In one week in September it was replaced by 24 little wings, a turbine, a governor and blades that snap off. How it works, and the ways it tried to kill its pilot.Fri, 25 Sep 2026 12:20:00 GMThelicoptersphysicsdeep-divehttps://sandbox-drive.digit.zone/posts/deep-dive-the-tyre/https://sandbox-drive.digit.zone/posts/deep-dive-the-tyre/The long version of how the tyres work, with the real numbers. A brush in the contact patch, a carcass that winds up, rain, heat and mud, and the parked cars that wouldn't stay parked.Fri, 25 Sep 2026 12:10:00 GMTphysicsdeep-divevehicleshttps://sandbox-drive.digit.zone/posts/under-the-hood/https://sandbox-drive.digit.zone/posts/under-the-hood/The one idea behind all the physics in Sandbox Drive, and a quick tour of where it leads, from the tyres to the gearbox to the steering wheel in your hands.Fri, 25 Sep 2026 12:00:00 GMTphysicsvehicleshttps://sandbox-drive.digit.zone/posts/hachijo-jima-at-1-1/https://sandbox-drive.digit.zone/posts/hachijo-jima-at-1-1/How a Japanese elevation survey, OpenStreetMap and a lot of aerial photos turn into a drivable island. Also, the case of the harbour that had no quays.Fri, 25 Sep 2026 11:00:00 GMThachijo-jimaworldbehind-the-sceneshttps://sandbox-drive.digit.zone/posts/from-shooter-to-island-sandbox/https://sandbox-drive.digit.zone/posts/from-shooter-to-island-sandbox/The first commit was a design document for a top-down shooter. Two weeks later there was a gearbox. How a game about guns turned into a game about machines, and why most of it has been built twice.Fri, 25 Sep 2026 10:00:00 GMThistorybehind-the-sceneshttps://sandbox-drive.digit.zone/posts/welcome-to-sandbox-drive/https://sandbox-drive.digit.zone/posts/welcome-to-sandbox-drive/What Sandbox Drive is, what already works, what very much doesn't yet, and why the map is a real island 290 km south of Tokyo.Fri, 25 Sep 2026 09:00:00 GMTannouncementoverviewhachijo-jima