Amazing work for Splatoon. Hope it stays as an evergreen title.
For reference, FW sales for Nintendo published Wii U titles according to MC:
New Super Mario Bros U 163,528
Nintendo Land 72,121
Game & Wario 22,491
Pikmin 3 92,720
New Super Luigi U 24,882 (Retail version. Was released digitally earlier)
The Wonderful 101 5,258
Legend of Zelda: Wind Waker HD 30,264
Wii Party U 37,371
Super Mario 3D World 99,588
Donkey Kong Country: Tropical Freeze 35,717
Mario Kart 8 325,892
Hyrule Warriors 69,090 (Not published by Nintendo in Japan but included because its Zelda)
Bayonetta 2 38,828
Captain Toad: Treasure Tracker 28,025
Super Smash Bros. For Wii U 227,527
Kirby and the Rainbow Curse 32,137
Mario Party 10 50,212