Crystal Tunnels (すいしょうの どうくつ?) is the first area in the Sparkling Labyrinth sector of Hey! Pikmin. It takes place mostly inside a cave filled with crystals. This is where Rock Pikmin are first found in the game, where they play an important role in destroying crystals in the way. After one of the final drops in the area, the player can break a crystal to the left to access the secret exit, and go to The Hollow Sky, or take the right path to the normal exit, which leads to the Echo Cavern. Crystal Tunnels is the second of the two areas available in the eShop demo.
Right at the start, there are some dirt blocks that need to be destroyed using the Pikmin hiding in a nearby bush. After digging down, a very light puzzle element is shown, in the form of a pathway that can no longer be accessed if the player destroys too many of the sand blocks. After descending some more, the path splits into two ways. To the left is a small drop, with walls lined with crystals that can be slid off of. At the bottom is a room, with the only exit blocked off by a crystal. Then, in a cutscene, Rock Pikmin on the other side notice the trapped captain, and rush to take out the crystal in the way.
A Bouncy Mushroom is then used to go back up, even though the path is blocked by crystals that get destroyed as the Rock Pikmin bounce on the mushroom. Moving ahead, a Crystalline Crushblat is encountered. The road after that goes forward, but by destroying a crystal that serves as a ramp to get here, a different path can be taken into a hole.
On the other side of this hole is a room with Speargrubs and Bouncy Mushrooms. Rock Pikmin must be thrown at the mushrooms to break a crystal at the top, which allows some more Rock Pikmin to join the crew. Hitting the enemies that walk back and forth will make them stand in place.
Back in the main path, there are more crystals and dirt blocks, and after that, there is a treasure that can only be accessed if the ramp crystal is not destroyed, the Grown-Up Dynamo. Further ahead, there are more block puzzles and enemies, until the second treasure is found, the Attention-Getting Logo.
Further ahead, there are some more Speargrubs that stand between a ledge where Olimar and the Pikmin end up at, and a ledge with the final treasure, the Snack Vault. After some more crystals and enemies, the player comes across a split in the path. If they take the left, there's the pod waiting for Olimar, but if the player takes the right, they can go through a path with more Sparklium, until they reach the pod in a different location. If the player takes the left exit, they will be brought to The Hollow Sky.
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