World 12-4 (Super Mario Maker for Nintendo 3DS)
From the Super Mario Wiki
The course starts with a Junior Clown Car coming down. The player needs this to get through the level. All the player needs to do is avoid all the obstacles through out the level. After Grinders on tracks, Winged Big Munchers come out of Pipes. After avoiding a few more Spike Traps, the player can get a 1-Up Mushroom and a Super Mushroom from ? Blocks before a fight with Big Bowser Jr. in a Junior Clown Car. The player doesn't need to defeat him as the axe is nearby.