4U had online multiplayer, it's 3U that only had local...I'm loving Monster Hunter 4U (better mechanics, better story, even though the multiplayer was local only).
If we are talking about brand new IP, I would say Steamworld Dig or Gunman Clive. Simple games but very addictive and very much harken back to easy to learn, difficult to master.
I loved A Link Between Worlds...
4U had online multiplayer, it's 3U that only had local...