Topic: Which Wii U games can't be played solely on the gamepad?

Off-TV play is a great feature, but I don't think that not including it (if the game calls for it) is a bad thing.

Mass Effect 3, Batman Arkham City, and Assassin's Creed. All games that support off-TV play because they were built with the one screen in mind anyway.

Lego City Undercover and ZombiU were both made specifically with the Wii U's dual screen interface in mind. I think both games work really well and don't see it as a "limitation" that they can't be played on the GamePad alone.

You might as well be saying it's a limitation that you can't play every Xbox game with the Kinect as your only controller.

ON TOPIC:
The only games I know of are Lego City Undercover, NintendoLand, and ZombiU.

Stop quibbling over his usage of a single word, people. You all knew exactly what he meant with his question. Instead of trying to illegitimatize his inquiry for whatever reason you may have, just answer him or leave it be.

Anyways, add the upcoming Fatal Frame title to the list, although in that case, it's clearly out of necessity since it puts the unique features of the gamepad to good use, instead of serving as something merely supplemental like a map or inventory screen, easily bypassed as seen by many native Wii U projects (Far more supports off-screen play here than just a few multiplatform releases).