Wii U

• Golden Sun
• Hyrule Warriors: The Hero of Hyrule Pack
• Kirby: Nightmare in Dream Land
• The Legend of Zelda: The Minish Cap
• Mario Kart 8
• Mario Kart 8 Bundle Pack
• Pushmo World
• Yoshi's Island: Super Mario Advance 3
• Super Smash Bros. Wii U
• Super Mario Maker
• Splatoon
• Mario Party 10
• Kirby And The Rainbow Curse
• Captain Toad
• Donkey Kong Country: Tropical Freeze
• Super Mario 3D World
• Legend of Zelda - Wind Waker HD
• Wonderful 101
• Pikmin 3
• Paper Mario (Wii eShop)
• Super Mario RPG (Wii eShop)
• Super Mario World (Wii eShop)
• Super Mario 3 (Wii eShop)
• Mario Kart 64 (Wii eShop)
• Super Metroid (Wii eShop)

3DS

• Kirby Fighters Deluxe
• The Legend of Zelda
• Punch-Out!! Featuring Mr. Dream
• Super Mario Bros. 3
• Puzzle & Dragons Z + Puzzle & Dragons Super Mario Bros
• LBX: Little Battlers eXperience
• Pokémon Mystery Dungeon: Gates to Infinity
• Kirby Triple Deluxe
• Super Smash Bros. 3DS
• Luigi's Mansion: Dark Moon
• Pokémon Alpha Sapphire
• Donkey Kong Country Returns 3D
• Tomodachi Life
• Disney Magical World
• Fire Emblem: Awakening
• New Super Mario Bros. 2
• Yoshi's New Island
• Bravely Default
• Fantasy Life
• Pokemon X
• The Legend of Zelda a Link Between Worlds

I'll update this list as I learn of more titles.

https://www.amazon.com/Bravely-Default-3DS-Digital-Code/dp/B014G0GGR0

It's for single items with the promotion. You have to look at it on the item's page.

Example: https://www.amazon.com/Bravely-Default-3DS-Digital-Code/dp/B014G0GGR0

Search for the "promotion" on the page.