Keen Software House announces a free weekend is now underway for Space Engineers on Steam, offering the chance to check out the sandbox space game until midday Sunday. They also announce a sale, saying both Space Engineers and Medieval Engineers are half-off over the weekend. This new trailer offers a look at the latest updates to the game, and here's the accompanying description: "After the release of Planets we are focusing this week on bug fixing and improving the building process. Placing your first block (base station) on a planet surface is now much more intuitive for newcomers and returning players. Blocks are aligned with gravity by default. You can start new grids (small/large ships, vehicles, base stations) from toolbar icons without going to G screen. This is the first iteration and more improvements are planned for the planetary building process."