Your most "Zen" experience in a game

[SvennoJ]

So many. It's either when a good song or piece of music comes on in a story driven game or when it's one of those 'get in the zone' games. For example the 3h endurance trial on the Nurburgring in GT5 feels like 20 minutes to me. Rez infinite and Thumper are pure Zen games.