MysteryBox is an app that allows you to share secret messages with a key.
Lock different types of locks and share your secret messages!

~ Types of keys ~
1. 1. Aikotoba
You can create a message that can only be seen by someone who knows the word. Create and share messages you want to share only with friends, lovers and special people!

2. 2. Time limit (opening / viewing)
You can create boxes that can only be opened during a specified period of time, or messages that can only be viewed during a specified period of time. Share special messages by creating messages that can only be seen in the middle of the night or that you want to share for a limited time!

Key types will be added in future updates.
We are currently developing a key to limit location information!
You will be able to compose messages that can only be seen in specific locations.

~ Favorite function ~
Boxes can be added to your favorites and kept in stock at any time.
It also supports ranking display based on the number of favorites.
Let's open the message that everyone likes!

-Limited release and open house-
[Open to the public]
Any user can challenge to open a box created as an open house. It will also be published in the ranking of the number of favorites and the number of opened, so let's create a box containing messages and puzzle-solving elements that you want to publish to an unspecified number of people for a limited time.
【Limited release】
A box created as a limited release can only be challenged by a user who knows the box ID. It will not be published in the ranking or new box. Create a box that you only want your friends, lovers, family, and other acquaintances to challenge.
Limited release boxes can be accessed by entering the box ID in the Box ID search on the search page.
Once you have created a limited release box, share the box ID with the people you want to challenge.

~ About box creation ~
The messages in the box may be viewed by an unspecified number of people. Please do not write personal information, illegal writing, or writing that is offensive to public order and morals.

～ About feedback ～
If you have any features you would like us to add to your app or areas you would like us to improve,
[email protected]
Please feel free to contact us.

* Screenshots are under development.