Reasonable on 14 April 2009
I guess they're including the additional play modes in Portal - not the main storyline levels.
Also, given Tetris doesn't actually have an end it seems odd to have it in the list. If you include games that just get harder until you fail then the list should be full of nothing but unbeatable games.
I wonder whether they were considering 'normal' difficulty or a games highest possible difficulty.
Try to be reasonable... its easier than you think...
