Excluding games that are explicitly not supposed to be a challenge, I'd have to say Twilight Princess. Built like OoT but with none of its challenge. I had a suit of invincibility and all 4 bottles, 3 with fairies (instant revival if you die) and one with fairy tears, which fully heals you and temporarily superpowers you. I never used the armor, never had a single fairy activate, and ended up using the tears during the final battle just for the lolz, even though I had been hit like once. Should have had a hard mode or something.