Algodoo

Dang, that title is a mouthful.

Anyway, this computer adds quite a lot that the Duo lacked. For one, it has an internal hard drive (which also means you can install operating systems). It has a heat system, which in and of itself is decorational, unless you pair it with another new feature - overclocking! Try to be the first to get the perfect tuning of overclocking, where its as fast as possible but it doesn't overheat! Thankfully you're safe from it shutting down due to thermal throttling... unless you turn it off.

This computer is quite flexible.

Also, it comes with a free copy of AlgoDOS, the Algodoo OS.