Well played microsoft

It's like the first half of "Portal". Essentially an extended player training exercise. (Source: Valve Developer Commentary)

Smaaart. Nice job

Well surely they knew it would entertain us - if it didn't no one would have used it - so it was a dual purpose. But yeah... good on them :)

Mouse fluency only? I actually learnt how to use a computer playing Solitaire. Still play it whenever I get the chance.