Heartopia is a peaceful game where gardening, cooking and fishing become gentle rituals in your daily routine. Although many of these activities are designed for solo play, Heartopia encourages cooperation and socializing. The Flashing Fish Shadow mission is an example where you have to team up with other players.
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How to unlock Flashing Fish Shadow Quest
The Flashing Fish Shadow Quest is awarded by Vanyathe fishing mentor. As you continue to complete his tasks, Vanya will eventually contact you about a special tool: Mermaid Fish Attraction. This tool draws rare fish into a focused area, allowing legendary targets to appear.
This triggers the Flashing Fish Shadow Quest. The goal of this endeavor is to share your Fish Attractor with others and find the flashing fish shadow, a glowing mystery beneath the waves. Unlike regular fishing tasks, this one pushes you beyond simple casts and reels.
How to find the flashing fish shadow in Heartopia
To increase your chances of finding the flashing fish shadow, go to the fishing village and talk to Billthe white-bearded NPC near the dock. Select the Sea Fishing Event option and select a boat. Once on board, you can invite friends or even random players to join you.
When the event starts, throw your Mermaid Fish Attractor into the water. From here everyone should start fishing within the attraction circle. Your goal is to catch a fish with a distinct blue glow.
Be sure to watch the water carefully. Most fish appear as dark or golden silhouettes. The Flashing Fish Shadow glows with a soft blue light which immediately sets it apart.
Here are some tips to increase your chances of finding the flashing fish shad:
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Catch fish quickly to refresh the spawns.
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Let everyone fish within the radius of the attractor.
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The more players involved, the faster the shadow tends to appear.
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If it doesn't appear, throw in another Fish Attractor and try again. You can buy them from Vanya.
Rabbit Fish did the job for us, and some other players have also reported that catching a Rabbit Fish completes this quest. It might be a different fish in your case, but you should aim for fish that emit a soft blue glow.
Even if one of your teammates reel in the glowing fish, it still counts towards your mission progress. You can expect the shadow to appear after about five or six catches.
Once the flashing fish shadow is caught, return to the beach and talk to Vanya to complete the quest.
Although Flashing Fish Shadow Quest is designed to be a team challenge, you can also try it alone. If you choose to go it alone, bring several mermaid fish attractors and choose deeper water areas.


- Released
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January 8, 2026
- Developer
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XD
- Publisher
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XD
- Number of players
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Single player
- Compatibility with Steam Deck
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Unknown