From the Super Mario Wiki
消しゴム参上！ (Keshigomu Sanjō!, Japanese for "Eraser is Here!") is Mr. Eraser's first official course in Super Mario Maker, released on November 4, 2015. It is set in the ground theme and in the Super Mario Bros. 3 game style.
The entire course consists of platforms made to resemble erasers. Grinders will occasionally fall onto tracks and move around the Note Blocks, and Mario must avoid them until he reaches the goal at the end.