Climb up the grass further. Drop down at the top and slide down the incline. You’ll now be in front of a network of blast barrels, be careful with your timing and launch upper-right, upper-right, upper-right, lower-right, upper-right and hit a switch, lower-right, upper-right and collect the letter N, upper-left, upper-left and lower left. This barrel will start sliding back and forth, launch when you are lined up with the banana coin and you’ll reach the next barrel. This next barrel will slide in the same way, launch to the next barrel. Launch to the lower-right into the last barrel, and you’ll end up in front of the second level checkpoint.
Beyond the level checkpoint, you’ll find an area with four birds running back and forth. Eliminate all the birds and part of the floor will rise. Pound it a few times to activate the wall behind you. The circular areas will take turns spinning and then lifting to make platforms and then dropping. Although the order they activate looks random, the same order will reset after the platforms have appeared and disappeared four times. Wait for the bottom-center wheel to spin, and jump up to land on the platform when it appears a moment later. From here, the upper-left platform will appear next. Then, once again, the upper-left platform. Next is upper-right, and upper-right again, where you will find the letter G. To get the last puzzle piece, jump down to the third platform from the top, down the left side, since it appears next. Jump upper-right, upper-left, and then jump to the platform to your left. Walk into the wall and you’ll find the seventh puzzle piece. If at any point you fall down to the floor, wait for the bottom center platform to spin and continue the pattern over again.