70 countries Marble Race challenge in Algodoo #2
Algodoo is a physicsbased 2D sandbox freeware from Algoryx Simulation AB (known simply as Algoryx) as the successor to the popular physics application Phun. It was released on September 1, 2009 and is presented as a learning tool, an open ended computer game, an animation tool, and an engineering tool.
Algodoo: http://www.algodoo.com/