Trunkin on 28 January 2014
Super Smash Bros. Brawl. Me and my siblings clocked between 500 and 1000hrs into that game over the course of three years. I'm pretty sure we spent well over 100 hours on Mario Kart Double Dash as well. That game had one of the most fun 4 player mode I've seen in a game to date. Good times.
The most time I've spent on a single player game was just around 45hrs(give or take) for both FFIX and Chrono Cross, and behind those are 35hrs on Pokemon Emerald and Fire Red. Didn't finish either of those, though.
