Via Perfectly-Nintendo.
North America
[Wii U] 30% off Earthbound Beginnings (Virtual Console): 20 Gold Coins [until September 1st]
[Wii U] 30% off Mario Kart 8 (eShop): 140 Gold Coins [until September 1st]
[Wii U] 15% off NES Remix (eShop): 150 Platinum Coins [until September 1st]
[Wii U] 15% off Super Mario 3D World (eShop): 300 Platinum Coins [until September 1st]
[Wii U] 15% off Wii Party U (eShop): 600 Platinum Coins [until September 1st]
[Wii U] Super Mario Bros. 3 (Virtual Console): 40 Gold Coins [until October 1st]
[Wii U] Super Mario Kart (Virtual Console): 60 Gold Coins [until October 1st]
[Wii U] Mario Kart 8: DLC Pack 1 (DLC): 60 Gold Coins [until October 1st]
[3DS] 30% off The Legend of Zelda: Ocarina of Time 3D (eShop): 50 Gold Coins [until September 1st]
[3DS] 30% off Kid Icarus: Uprising (eShop): 80 Gold Coins [until September 1st]
[3DS] 30% off Fire Emblem Awakening (eShop): 80 Gold Coins [until September 1st]
[3DS] 15% off Mario Party: Island Tour (eShop): 300 Platinum Coins [until September 1st]
[3DS] Metroid II: Return of Samus (Virtual Console): 30 Gold Coins [until October 1st]
[3DS] Wario Land 3 (Virtual Console): 40 Gold Coins [until October 1st]
[3DS] Donkey Kong 3 (Virtual Console): 40 Gold Coins [until October 1st]
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****Please note EU usually gets additional rewards mid-month.*****
Europe
[New 3DS] 50% off Pilotwings (Virtual Console): 25 Gold Coins [available until September 16th]
[Wii U] 50% off Pilotwings (Virtual Console): 25 Gold Coins [available until September 16th]
[Wii U] 40% off Donkey Kong Country: Tropical Freeze (eShop): 60 Gold Coins [available until Septemer 16th]
[3DS] 20% off Puzzle & Dragons Z + Puzzle & Dragons Super Mario Bros. Edition (eShop): 600 Platinum Coins [available until September 16th]
[New 3DS] Pilotwings (Virtual Console): 65 Gold Coins [available until November 1st]
[Wii U] Pilotwings (Virtual Console): 65 Gold Coins [available until November 1st]
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Japan
[3DS] 20% off The Legend of Zelda: Majoras Mask 3D (eShop): 65 Gold Coins [until September 30th]
[3DS] 20% off Famicom Remix: Best Choice (eShop): 55 Gold Coins [until September 30th]
[3DS] 25% off Mario and Donkey Kong: Minis on the Move (eShop): 25 Gold Coins [until September 30th]
[Wii U] 20% off New Super Mario Bros. U (eShop): 80 Gold Coins [until September 30th]
--
Ongoing list of rewards, including these and previous rewards not yet expired: http://www.perfectly-nintendo.com/my-nintendo-list-of-rewards-europe-north-america-japan/
North America
[Wii U] 30% off Earthbound Beginnings (Virtual Console): 20 Gold Coins [until September 1st]
[Wii U] 30% off Mario Kart 8 (eShop): 140 Gold Coins [until September 1st]
[Wii U] 15% off NES Remix (eShop): 150 Platinum Coins [until September 1st]
[Wii U] 15% off Super Mario 3D World (eShop): 300 Platinum Coins [until September 1st]
[Wii U] 15% off Wii Party U (eShop): 600 Platinum Coins [until September 1st]
[Wii U] Super Mario Bros. 3 (Virtual Console): 40 Gold Coins [until October 1st]
[Wii U] Super Mario Kart (Virtual Console): 60 Gold Coins [until October 1st]
[Wii U] Mario Kart 8: DLC Pack 1 (DLC): 60 Gold Coins [until October 1st]
[3DS] 30% off The Legend of Zelda: Ocarina of Time 3D (eShop): 50 Gold Coins [until September 1st]
[3DS] 30% off Kid Icarus: Uprising (eShop): 80 Gold Coins [until September 1st]
[3DS] 30% off Fire Emblem Awakening (eShop): 80 Gold Coins [until September 1st]
[3DS] 15% off Mario Party: Island Tour (eShop): 300 Platinum Coins [until September 1st]
[3DS] Metroid II: Return of Samus (Virtual Console): 30 Gold Coins [until October 1st]
[3DS] Wario Land 3 (Virtual Console): 40 Gold Coins [until October 1st]
[3DS] Donkey Kong 3 (Virtual Console): 40 Gold Coins [until October 1st]
-
****Please note EU usually gets additional rewards mid-month.*****
Europe
[New 3DS] 50% off Pilotwings (Virtual Console): 25 Gold Coins [available until September 16th]
[Wii U] 50% off Pilotwings (Virtual Console): 25 Gold Coins [available until September 16th]
[Wii U] 40% off Donkey Kong Country: Tropical Freeze (eShop): 60 Gold Coins [available until Septemer 16th]
[3DS] 20% off Puzzle & Dragons Z + Puzzle & Dragons Super Mario Bros. Edition (eShop): 600 Platinum Coins [available until September 16th]
[New 3DS] Pilotwings (Virtual Console): 65 Gold Coins [available until November 1st]
[Wii U] Pilotwings (Virtual Console): 65 Gold Coins [available until November 1st]
-
Japan
[3DS] 20% off The Legend of Zelda: Majoras Mask 3D (eShop): 65 Gold Coins [until September 30th]
[3DS] 20% off Famicom Remix: Best Choice (eShop): 55 Gold Coins [until September 30th]
[3DS] 25% off Mario and Donkey Kong: Minis on the Move (eShop): 25 Gold Coins [until September 30th]
[Wii U] 20% off New Super Mario Bros. U (eShop): 80 Gold Coins [until September 30th]
--
Ongoing list of rewards, including these and previous rewards not yet expired: http://www.perfectly-nintendo.com/my-nintendo-list-of-rewards-europe-north-america-japan/