Epic Games originally wowed us with its Epic Citadel tech demo that put the Unreal Engine 3 onto Apple’s iOS platform. The result of that was the Infinity Blade Series in iOS: a real-time rendered game with PC quality graphics and effects.
You will need the latest version of Firefox to try this out; my attempt with loading in Chrome caused a plugin crash instead.
Try it out here.
For a more technical description here’s the Ars Technica article.