The Day 4 Onsen Egg Promise Treasure Hunt egg is behind Blanc’s flower stand. Use your camera to photograph it. A guide video also points out a separate bubble near Deer Tower; that is a different objective, not the egg’s hiding place.
Where is the Day 4 egg?
- Go to Blanc’s flower stand.
- Check behind the stand for the egg.
- Open the in-game camera and photograph the egg to register the find.
The location is reported by a guide entry dated February 3, 2026, and is also shown in a video guide: Day 4 egg location guide and video guide.
What about the bubble near Deer Tower?
The video guide mentions a bubble near Deer Tower as a separate objective. If your activity tracker still shows that objective, search for the bubble there; it is not the Day 4 egg, which is behind Blanc’s flower stand. Video guide.
How the treasure hunt works
The guides describe the Onsen Egg Promise Treasure Hunt as part of Heartopia’s Winter Frost Season. It uses the camera to photograph hidden eggs. One event guide says that finding all 16 eggs unlocks the Onsen Egg recipe; this is a guide-reported in-game reward. Event guide Photo interaction guide.
Is the Day 4 hunt still available?
The location guides document a seasonal event and associate this Day 4 entry with February 3, 2026. They do not establish whether the activity is currently available, so treat this as a historical location guide rather than confirmation that the hunt is active now. No official publisher notice confirming current availability or the precise location was identified in the cited guides.
Quick Recap
Best Value
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Rank #4
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Rank #3
Rank #2
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