Treacherous Currents (うごく すいめん?) is the secret area in the Verdant Waterfront. At the start, nothing in the area is submerged. When the player progresses a bit past the start, the main gameplay mechanic starts: the level of water goes up rapidly, and submerges most of the stage. After 10 seconds have passed, it slowly dips back down, stopping a bit before going off-camera. After 2 seconds, it speeds back up again, repeating the cycle. This creates scenarios where the player has to wait and time their actions to make the most out of both dry land and underwater movement.
The area is submerged in water, whose level goes up and down very regularly. The player must let the water rise in order to be able to swim up and down to avoid obstacles, such as brambles and Hydroe brambles, and keep going in the level. After some walking in the area, Olimar can enter a doorway. On the other side stands a Young Yellow Wollywog and the Everyday Cell. The second treasure, the Giant Rodent Skull can be found later in the area, before a wall of dirt blocks. The player has to be careful of the Large Splurchin near the treasure. The exit isn't too far away; the player just has to go through a horizontal corridor filled with Puckering Blinnows.
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