NES:
Mother (on the Wii U VC)
SMB 3 (also on the Wii U VC)
SNES:
Earthbound (Wii U VC)
N64:
DK64 (Wii U)
Pokemon Snap (Wii)
Paper Mario (Wii U)
Gamecube:
SSX Tricky
Wii:
Pikmin 2
Wii U:
Pikmin 3
Super Mario 3D World
The Wonderful 101
Bayonetta
Bayonetta 2
Captain Toad
ZombiU
Nintendo Land
Yoshi's Woolly World
PS4:
Fallout 4
DS:
Phoenix Wright 1
Pokemon White 2
Elite Beat Agents
3DS:
Pokemon Super Mystery Dungeon
Pokemon Omega Ruby
Pokemon Alpha Sapphire
Pokemon X
Pokemon Y
Fire Emblem Fates: Birthright
Fire Emblem Fates: Conquest
Fire Emblem Fates: Invisible Kingdom
Fire Emblem: Awakening
Super Smash Bros. (100%'ed it, finally)
Mario Kart 7 (unlocked all the parts, completed all the cups)
I thought that I played less video games than usual this year, but apparently not.