Soundwave on 18 June 2016
Not much.
Every big Nintendo IP has been hyped here as the messiah for Wii U sales (first it was NSMB, then Super Mario 3D World, then Mario Kart 8, then Smash Brothers, then Splatoon).
Mario Kart 8 caused a modest 2 month bump in the West with a free game promotion.
Splatoon caused a OK hardware boost in Japan for a little while.
That was basically it. Sales levels for the machine were still consistently under the GameCube even with those bumps.
