We had no problems browsing, watching movies, firing emails out and even playing games such as Angry Birds. (pocket-lint.com)
Now I'm not actually talking about playing through mail, but rather using the term to describe the style of play that we see with games such as Words With Friends. (carrypad.com)
Other games such as Dark Souls use difficulty as a way to get the player to immerse themselves in the world and you are rewarded for your efforts with better items. (the-games-blog.com)