This guide explains how to solve the hidden button puzzle in Fischl, a Roblox game, to obtain the Red Energy Crystal needed for Heaven's Rod. This powerful fishing rod requires finding four Energy Crystals, with the Red Crystal being the most challenging to acquire.
The Puzzle: Obtaining the Red Energy Crystal
The Northern Summit area presents a challenging climb, rewarding players with the opportunity to obtain Heaven's Rod (1,750,000 C$). However, accessing the final, Red Energy Crystal requires completing a secondary quest. After finding the first three crystals, an NPC in the Glacial Grotto will direct you to find five hidden buttons across various islands. Pressing all five unlocks the Red Crystal.
Button Locations:
The following outlines the location of each button:

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Moosewood Island: Locate the button behind the leaderboard, near the pier. It's close to the ground.
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Roslit Bay: Proceed inland from the pier. Near the campsite, you'll find the Angler NPC. The button is hidden amongst logs on the ground.
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Forsaken Shores: Head to the watchtowers on the right side of the island (visible from the boat due to a red glow). Climb the tower nearest the pier.
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Snowcap Island: Travel to Upper Snowcap and locate the Wilson NPC. The button is concealed within the wooden fence beside him.
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Ancient Isle: Visit the unfinished lighthouse. The final button is situated on the side of the entrance.

After activating all five buttons, return to the Glacial Grotto NPC. Interacting with them again will open the passage leading to the Red Energy Crystal, completing the puzzle.
Video Walkthrough: (Note: A video walkthrough would be included here, but I cannot directly embed or create videos.) Search for "[Game Name] Red Energy Crystal Guide" on video platforms like YouTube for visual assistance.