Seriously, if you play Tetris for long enough, all you see are falling blocks...everywhere you look! You see them in your dreams. You imagine them as overlays on the windshiled while you drive your car. You can't stop thinking about them. They're everywhere! I'm sure the only reason a movie based on these demonic falling blocks would not get a perfect 10/10 rating is that viewers would be frustrated by the inability to interact with the blocks and spontaneously explode on the sofa.
Zak! Great game, not sure if it would make a good movie though.
Ico... hmm... I could imagine some kind of serialised cartooon but not live action. I'd certainly like them to stay well away from doing anything with the core stories, but some kind of episodic anime working as backstory could actually work. I think it's the only way you could capture the same look and feel.
Otherwise I'm kind of in the "please make it stop" camp.