I'll pitch some ideas for WiiU Zelda.
A new evil force is threatening to destroy the barriers between parallel worlds for his own personal gain. It comes to your attention that an ancient contraption from legends has been activated in a long lost civilization. A strange orb, a relic of ancient times, starts to show strange activity. According to the legend this will be an integral piece to reach the forbidden city deep underground to repair or shut off the device.
The orb shows location specific clues and scenes from parallel universes delivered to the player on the WiiU remote. If you opt to allow online play, these scenes will be views of other player's efforts.
The further you travel to the forbidden city the more frequent and solid the connection starts to become to the parallel worlds. Ghost images from what happens on the wiiU remote start to appear in your real world. At certain points you will have to coordinate your efforts with someone from a parallel universe to overcome obstacles.
From simple standing on floor plates, to block puzzles where the blocks have physical properties in both worlds or platforms that you can only stand on in your universe when parallel links stands on it in his and vice versa.
There will be clues / information you can only find in your world (randomized) which you can share / teach to a parallel you by use of the wiiU remote. For example songs. Deeper in the forbidden city you can also exchange physical items. Materials for upgrades for example, some maybe be rare in your world and abundant in another.
At some points you can solidify the connection to opt to tackle boss fights together. At one point it all goes haywire and you end up in a massive battle with 50 links battling multiple copies of a difficult boss.
All of this should work offline too with decent AI coop. The same way fat princess handles also works offline.
There should be plenty of alone time play as well of course, but exploring some co-op and WiiU remote visions into other players world could be fun.







