So hard to pick a best ever, but i must admit Mario kart on the SNES was pretty ground breaking and addictive for me- mode 7 was amazing. Actual real corners to go around rather than the usual "track bends in front of you"

But that was such along time ago, so im going with a newish game in Bioshock. The story was totally enthralling. Spent most my time at work daydreaming about how it would unravel and it sure delivered. Actually my co-workers must have got sick of me at talking about the game all day long LOL. I could go on about bioshock forever, shame it had to end....

Quickly mention perfect dark for N64. Spent alot of hours with this one.