World 6-4 (Super Mario Maker for Nintendo 3DS)
From the Super Mario Wiki
Right from the start, Mario gets a Super Mushroom. After this, a Trampoline pushes the player. There are Trampolines so that the player keeps moving. As a matter of fact, the whole level can be played without using left or right, however Jumps and Crouches are necessary. This is possible due to the ice all over the level. Above the two Trampolines is a Conveyor Belt then a place where the player needs to Crouch. There is a lava pit below, but unless the player is slow, there is no threat. After another Crouch, the player can choose to jump over some trampolines, or use them to get the first Pink Coin. The next area, jumping over the trampoline would result in having to move Mario, but if the other path is taken, another Pink Coin is found. After this, the player needs to Crouch while two Trampolines help them get down. After this is a tricky jump, put with some practice is easily done. In the next area, one path has Flimsy Lifts to help, but requires Mario to move after getting to the top. The other gives Mario the third Pink Coin then brings him up via Blue Lava Lift on a track and places him on a Conveyor Belt. After this, Mario must crouch again, then some Trampolines allow him to move. In the next two areas, Trampolines help Mario get the last two Pink Coins, but these can also be jumped over. After this is a locked Warp Door, which can't be opened if crouched. The Warp Door leads to 10 coins. After this, the axe is very near. A Piranha Plant and a Hammer Bro. guard this axe.