The Dunes - Infinity Dunes

Infinity Dunes - Stage 1

This area is laden with quicksand which will cause you to sink if you stand on one spot a few seconds too long. But it should be fine to walk on as long as you don't stop. That said, pick up your items and head north, crossing the gap using the water rod. Moving forward, you'll spot a switch to step on, then blow away the small sand piles to reveal a couple more switches. Two on the ground and another on the block. This will extend a bridge, allowing you to cross over to the gateway.

Infinity Dunes - Stage 2

Quick one here. All you need to do is defeat all the enemies to open a path to the exit. You can water the sprouts on the left and right sides to grow bomb flowers. Use on monsters in the middle.

Infinity Dunes - Stage 3

Walk forward to see the gateway being sealed shut so it looks like you'll have to take the long way to get to it. Head left and water the sprout to grow a leaf and use it to take everyone higher. Grow the next sprout, pick up a rock and ride the leaf up so you can throw it at the orb. Water rod across the sandfall to reach the section. Here, you will want to have two heroes standing to the far right and another gust jar hero on the left side of the sandfall. Use the gust jar to blow a bomb over the gap and swiftly switch characters to catch it. Next, quickly use the water rod lift the bomb hero so that he can toss the explosive at the orb. This opens the second door allowing access to the exit.

Infinity Dunes - Stage 4

The level starts with an encounter against one Hokkubokku. Use the gust jar to blow off its segments so the head falls for you to attack with the sword. The water rod on the other hand can stun the entire pile, so that's probably your best option. Once that first enemy is dead, three more of its friends will appear. At this point, it will be chaotic to stay on the ground once the pieces start flying so use the water rod to stay safe and attack. The exit appears when the boss is defeated.