The original Hyrule Warriors.
Legend mode on all difficulties, all five adventure maps, challenge mode with gold for all 19 characters, challenge mode with Ganon and the chicken, and all 21 of these characters at max level 250. All 19 regular characters had ultimate weapons for all the weapon types they could use, and all achievements were unlocked. I think that took around 320 hours in total.
Later on, Hyrule Warriors Legends was released for the 3DS with additional content that was partly added to the Wii U version as well, so my 100% file got knocked down to incomplete.
I did purchase Hyrule Warriors: Definitive Edition for Switch (I skipped Legends on the 3DS), but so far I am only around 50% through its adventure mode and therefore still have a long way to go. I estimate that I've played under 100 hours and the whole thing will take around 500 hours to get everyone ultimate weapons and level 250 on top of finishing all modes.
Legend11 correctly predicted that GTA IV will outsell Super Smash Bros. Brawl. I was wrong.
