Easily almost any Pokémon game, specifically anything that's been recently released. For me, Pokémon Diamond and Pokémon Soul Silver have several hundred hours clocked ranging from 200-400 hours. Second longest game, not sure if this would count, but Animal Crossing: Wild World is an extremely long game. This is probably due to the fact, oh yeah, you can't beat it (necessarily, it'd take forever to collect everything)...... I've spent about 200-300 hours playing this game and I STILL haven't "beat it". If I had to pick a Zelda game that I've played I'd choose either Skyward Sword or Twilight Princess. Both of which had a pretty decent amount of length, and I spent about a good 100 hours on each.