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⚡ Have you found all the eggs in Heartopia? You can now cook the Onsen egg recipe. Check out our guide!
It's Winter Frost Season in Heartopia, and one of the key activities is the treasure hunt! Your objective: find the eggs hidden in the Thermal Mountains. This guide explains how to unlock the feature and gives the locations of the Heartopia Eggs, so you don't miss out on any rewards.
The Onsen Egg Promise Treasure Hunt is a Winter Frost Season activity. Each day, you have to find a hidden egg in the Onsen Mountain, the central area of the event.

Take a photo of yourself next to the egg, and you'll get a great reward!
⚡ Good to know: we've put together a full guide to Heartopia's Winter Frost Season !
Before you can set off in search of the Heartopia Eggs, you need to unlock the treasure hunt feature. Here are the necessary steps.
To unlock any Winter Frost Season activity, including the Heartopia Eggs quest, you'll need to talk to Eric, who will give you a few missions:

You've now unlocked the Heartopia Eggs hunt, as well as all the other activities, such as the concerts. But you still need to trigger this feature...!
Naughty is an NPC located in the Onsen Mountain, on a high passageway overlooking the igloo. Talk to him, then accept his quest. You can now go egg hunting!
Go to the Winter Frost Season menu.

Click on Fashion activities and then on the Treasure Hunt icon. Select "Go" to set off on your egg hunt.

Heartopia Eggs for the Winter Frost Season are spread around the event hub, in the Onsen Mountain. You can find an egg every day. This list will be updated regularly, to help you collect all the Heartopia treasure hunt rewards.
| Day | Egg location |
|---|---|
| Day 1 | On the fence, just behind Naughty![]() |
| Day 2 | On the snow statue in front of the ice rink![]() |
| Day 3 | Under the stairs to the igloo![]() |
| Day 4 | Behind the Blanc stand![]() |
| Day 5 | On top of Massimo stand![]() |
| Day 6 |
The fence on top of the igloo
|
| Day 7 |
Inside the igloo
|
| Day 8 |
Above the coffee table |
| Day 9 |
On a rock by the beach, near the concert gate
|
| Day 10 |
On Blanc's stand
|
| Day 11 |
In the palm tree, opposite Massimo's stand
|
| Jour 12 |
Behind the bush, opposite the igloo
|
| Day 13 |
Above the fishing stand
|
| Day 14 |
Above Massimo's stand
|
| Day 15 |
At the edge of the ice rink
|
| Day 16 |
In front of the big rock, opposite the igloo
|
⚡ My tip : don't worry if you start the Eggs hunt a few days late. As soon as you've unlocked this feature, you'll be able to retrieve hidden eggs from previous days!
Have you spotted a hidden egg? Take a photo next to it! You'll be rewarded with some great prizes.
By completing your Heartopia Eggs Hunt, you'll increase your chances of obtaining Happiness Stars and Fashionwave Tokens. Each new egg you find and take a photo of has a chance of giving you 5 Lucky Stars and 300 Fashionwave Tokens. Please note: these rewards are not given to you automatically - they're yours to win!
⚡ Bonus Mobi.gg: if you want to get free wishing stars, check out the Heartopia codes!
Once you've completed all the eggs in the Winter Frost Season Treasure Hunt in Heartopia, you'll get the recipe for the Onsen Egg!
Now you know how to unlock the treasure hunt and find the Heartopia Eggs! The editors have put together some other guides to help you get the most out of your favourite cozy game:
Enjoy the game!
You must first unlock the 'Treasure Hunt' feature by completing Eric's quests, and then talking to Naughty.
Yes, you can collect all the Treasure Hunt eggs by visiting the various locations mentioned in this guide. So you can start this activity at any time during the Winter Frost Season.
The daily egg appears in your waiter's restaurant at 6am.
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