Hello Kitty Island Adventure brings you to a vast archipelago for you to explore. At the beginning of the game, you will have to travel the old-fashioned way; running (and swimming) to reach the destination. Fortunately, you'll eventually be able to unlock a fast travel system.

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In this guide, we'll take a look at how to unlock this fast travel system and where each point is located. Instead of traveling wherever you want, you'll also be able to unlock and travel to mailboxes, which are displayed on the map. First, let's dive into the mission you need to complete to unlock these mailboxes.
How to unlock mailboxes
To unlock mailboxes, you will need to complete the mission Delivery Service. This mission will unlock when you will become friends with Kuromi at level one. Once this happens, Kuromi will be waiting for you at a mailbox in Spooky Swamp.
At this point, it will have to give a pumpkin to My Melody, and then bring back a plant for Kuromi. On your way back, Cinnamoroll will explain the mailboxes, which you can go back to the scary swamp to deliver the plant.
Once this is done, fast travel will unlock! If you want to actually use mailboxes, you'll need to discover them first. This means you won't be able to teleport to an area you've never been to before.
All mailbox locations
Below you can check all available mailboxes to teleport to Hello Kitty Island Adventure. Not all of these locations are available to visit from the start of the game. To unlock them, continue complete quests and increase your friendship level with everyone. I've noted if all mailboxes can only be found by exploring or if quests/tasks must be completed beforehand.
From the map, you will be able to see a full list of all mailboxes. Any mailbox in an area you've explored but not seen yet displayed as question marks. This will help you track any mailboxes you may have missed.
Seaside resort
- Instantly unlockable (no quests required): Yes
PO Box Number |
The name on the map |
Location |
---|---|---|
1 |
Moon Island |
This island is shaped like a crescent on the left side of the sea The mailbox is on the right “point” of the moon |
2 |
Hopscotch Islands |
This is just below Moon Island on the left side of the island with high ground |
3 |
Resort docks |
This is right on the docks! |
4 |
Comfortable islands |
This mailbox is north of the Resort Plaza on the top right island |
5 |
Resort Plaza |
This is just to the right of the Resort Plaza |
6 |
The resort gate |
This is just south of the gate leading to the Spooky Swamp |
Scary Swamp
- Instant unlockable (no quests required): Yes
PO Box Number |
The name on the map |
Location |
---|---|---|
1 |
The ghost tour |
This is in the upper left corner of the area at the start of the Ghost Tour |
2 |
Scary Swamp |
This is in the central square of the area |
3 |
Nature Reserve |
This is in the southeast corner of the swamp, next to the Nature Reserve building |
Rainbox Reef
- Instant unlockable (no quests required): Not
PO Box Number |
The name on the map |
Location |
---|---|---|
1 |
Sunken ship |
This is next to the tail section of the ship along the northern edge of the reef |
2 |
The kelp maze |
This is just south of the dock leading down from Gemstone Mountain |
3 |
The comedy club |
This is right outside the club where Hangyodon is found |
There is a fourth mailbox that unlocks once you have arrived complete the mission Direct to your heart. This is part of a longer series that has been going on for some time.
Mount Hothead
- Instant unlockable (no quests required): Not
PO Box Number |
The name on the map |
Location |
---|---|---|
1 |
Caldera |
It is located at the top of Mount Hothead |
2 |
Thermal springs |
It is located in the upper right section of the map in an area with a beach |
3 |
Upper Ruins Entrance |
This is just north of the Mount Hothead mailbox, unlocked through the Enraged Ruins quest |
4 |
Hothead Mountain |
This is the “central” mailbox near the entrance to the large ruins Retsuko is usually nearby |
Gemstone Mountain
- Instant unlockable (no quests required): Yes
PO Box Number |
The name on the map |
Location |
---|---|---|
1 |
Gemstone Corral |
This is a little north of the Oasis mailbox |
2 |
Oasis |
This is next to the boat where Pompompurin is found |
3 |
The city of precious stones |
This is in the center of the city, just below the two buildings |
Through missions, you will be able to restore the area and bring some water back. This does not affect the placement of mailboxes.
The frozen peak
- Instantly unlockable (no quests required): Not
There are two Icy Peak mailboxes. The first is technically in Gemstone Mountain; this mailbox is in upper right corner of the map. Once you are done A challenging reward, you will be able to enter the area.
There is also a waypoint at the top of the Frozen Peak. Getting here can be quite a journey, but once the mailbox has been unlocked, you can easily travel there.
Merry Meadows
Instantly unlockable (no quests required): Not
PO Box Number |
The name on the map |
Location |
---|---|---|
1 |
Merry Meadows Fields |
This is in the lower left corner of the map |
2 |
Merry Meadows Plaza |
This is on the circular island in the center of the map |
3 |
Merry Meadows Overlook |
This is on the small overlook, slightly southwest of the Plaza mailbox |
4 |
Meadows Creation Station |
This is directly to the right of the Plaza mailbox next to the Creation Station |
5 |
Temple Meadows |
This is near the left bridge at the top of the map |
6 |
Meadows Gazebo |
This is in the far right area, but you'll need to unlock the area first This is done by growing a bean stalk |
The City of the City
-
Instantly unlockable (no quests required): Yes
-
This only applies to the three mailboxes citywide
-
PO Box Number |
The name on the map |
Location |
---|---|---|
1 |
City center |
This is north of the main dock at the top of the road |
2 |
City Critter Park |
This is at the bottom edge of the park, which looks like a giant green circle on the right edge of the map. |
3 |
The roof of the city |
This is northwest of the park mailbox, on a rooftop to the right of the green hex |
There are three additional mailboxes that do not appear on the main map. These three are llocated in the sewer, with the following names.
- Main drain
- Bottom channel
- Superior drainage
Channeling will unlock after completing Above and Below. It doesn't exist official in-game channel map, but the Hello Kitty Island Adventure community has your back. If you need help navigating the sewers, check out this map from u/ktroma on Reddit, where they share sewerage arrangement, including the three post boxes.

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