By 
Two new NES Remix courses have become available in Super Mario Maker for the Wii U, and completing the new levels in the Event Courses will net you the Excitebike and Birdo costumes.
Here’s a look at both courses and costumes, as well as a little bit of information on each.
NES Remix (Excitebike):
“In the NES Remix series, a variety of classic Nintendo Entertainment System games are given a new lease on life. This time, we’ve picked the Excitebike stage to recreate in Super Mario Maker! Hold the dash button and right on the +Control Pad from the moment the course begins to replicate the authentic motocross experience.”
NES Remix (Super Mario Bros. 2):
“In the NES Remix series, a variety of classic Nintendo Entertainment System games are given a new lease on life. This time, we’ve picked the Super Mario Bros. 2 stages to recreate! If you’ve played the original game, you’ll recognize many of the locations and elements. In true NES Remix style, it’s all very familiar, yet somehow a little different.”
Super Mario Maker is available for the Wii U.
