Steam:
- Valkyria Chronicles
- Minerva's Den (Bioshock 2 DLC)
3DS:
- The Legend of Zelda: Ocarina of Time 3D
- The Legend of Zelda: Majora's Mask 3D
- Xenoblade Chronicles 3D
Wii U
- Super Mario 3D World
- Nintendo Land
- New Super Mario Bros. U
- New Super Luigi U
- Hyrule Warriors
- The Wonderful 101
- Mario Kart 8
- Captain Toad: Treasure Tracker
- Kirby and the Rainbow Curse
- Bayonetta 2
- NES Remix Pack
- Super Smash Bros. for Wii U
- The Legend of Zelda: The Wind Waker HD
- Mario Party 10
I've also bought all DLC packs for Mario Kart 8 and Hyrule Warriors, all DLC fighters for Smash (both versions) and some DLC packs for Fire Emblem Awakening. If it counts, I've also bought some amiibo:
- Mario Smash
- Charizard
- Kirby
- Toad
- Ike
- Marth
- Link
- Pac-Man
- Young Link
- Zelda
- Sheik
- Silver Mario
My Wii U and my New 3DS were also bought this year.
A pretty packed year... and it's only June.