Out of this list, I pick Ocarina of Time. I know many people think that Majora's Mask was a harder game than Ocarina of Time, but I didn't think so. I got stuck on the Forest Temple a few times, found the Water Temple actually harder than the Great Bay Temple, and got stuck a few times on the Spirit Temple. But the only place that got my stuck in Majora's Mask really was the Stone Tower Temple. So my vote goes to OoT.