Atmosphir, a free 3D adventure game and design tool by Minor Studios allows users to create their own games or their own gaming levels, then play on their platform (PC or Mac) and share them by uploading to Atmosphir website.
Actually Atmosphir is a Mario-like game for the PC and Mac, witha a easy-to-use level editor. The game has same kind of low end graphics and platform based gameplay like Super Mario 64. The big difference between this game and others like it is that Atmosphir will be released to the public for free allowing users to not only play the game but also create levels.
The tools provided by Atmosphir are split up into packages of “blocks” that are both interchangeable and feature simple gameplay devices like moving platforms, and various themed texture elements that let you build worlds with grass, dirt, and sand.