World 1-2 (Super Mario Maker for Nintendo 3DS)
From the Super Mario Wiki
First, the Warp Pipe is actually the fourth pipe. In between the first and the second pipe is the first Koopa formation plus a Green Koopa Troopa on top instead of the Big Red Koopa Troopa formation besides three coins above them. Between the second and the third, first two coins then the first formation and using the big shell, the player gets access to two ? Blocks, one of which contains a Super Mushroom. After that, the Red Koopa Troopa formation with an additional Red Koopa Troopa on top is near the pipe which contains a Piranha Plant. The player can then enter the pipe or hit hidden blocks underneath coins to reach the top and the tall coin formations. If the Warp Pipe is taken, back in the ground setting, instead of coins coming out the right most block, there is a Lakitu's Cloud that can be used to bypass the doors as Small Mario. If the vine is taken, there are two Cloud Blocks on both sides of the top of the vine. The right hidden block in the tall formation of coins now has a Weird Mushroom and the middle one just has a regular sized Green Koopa Troopa.