> ## Documentation Index
> Fetch the complete documentation index at: https://cachi-docs.arisucloud.com/llms.txt
> Use this file to discover all available pages before exploring further.

# Online System

> Registration, Login, and Leaderboards

## Registration & Login

1. Tap the button next to the Mod button in the song selection menu to open the login/register page.

   <Frame caption="Login Entry">
     <img src="https://mintcdn.com/irisugame/zl-5DKXn93kATmfm/images/cachi/image-20260105145259489.png?fit=max&auto=format&n=zl-5DKXn93kATmfm&q=85&s=a4a60d2942a6b1ba851d088b3ef623c3" alt="Login Entry" width="1922" height="1082" data-path="images/cachi/image-20260105145259489.png" />
   </Frame>

2. Login with username or email. If you don't have an account, tap **Register** at the bottom.

   <Frame caption="Login Page">
     <img src="https://mintcdn.com/irisugame/zl-5DKXn93kATmfm/images/cachi/login.png?fit=max&auto=format&n=zl-5DKXn93kATmfm&q=85&s=e67386adc517a339b12bfd29ae288770" alt="Login Page" width="1922" height="1080" data-path="images/cachi/login.png" />
   </Frame>

3. Registration requires a valid email for verification.

   * **Username**: 3-10 characters, allowing letters, numbers, and `[] - _`.
   * **Password**: 8-16 characters.

   <Frame caption="Register Page">
     <img src="https://mintcdn.com/irisugame/zl-5DKXn93kATmfm/images/cachi/register.png?fit=max&auto=format&n=zl-5DKXn93kATmfm&q=85&s=ab5f097cead4fe52fcc20204151cf94c" alt="Register Page" width="1922" height="1080" data-path="images/cachi/register.png" />
   </Frame>

4. Once logged in, the game will auto-login subsequently unless IP or device changes. Tap the top-right corner to view stats or logout.

   <Frame caption="User Info">
     <img src="https://mintcdn.com/irisugame/zl-5DKXn93kATmfm/images/cachi/pinfo.png?fit=max&auto=format&n=zl-5DKXn93kATmfm&q=85&s=3eb2fb479e1ac0e773192d5302c1dfe2" alt="User Info" width="1922" height="1080" data-path="images/cachi/pinfo.png" />
   </Frame>

## Avatar

The game uses [Cravatar](https://cravatar.com/) for avatars, matching your registration email.

It falls back in the order: `Cravatar -> Gravatar -> QQ`.

To change your avatar, register on [Cravatar](https://cravatar.com/) or [Gravatar](https://gravatar.com/) with the same email used for Cachi.

## Score Submission

After logging in, scores for **all charts** available on OSU! (CTB) or Malody (Catch) official sites can be submitted.

* Both Rank and Unrank charts are supported.
* Scores can be submitted with **any Mod enabled**.
* Charts not found on official sites (e.g., deleted or unuploaded) will be rejected.
* For Unranked charts, please ensure you are using the latest version. If the mapper updates the chart, score submission for older versions may fail.

## Leaderboards

There are 4 types of leaderboards:

1. **Local**: Your local high scores.
2. **Rank**: Leaderboard for scores with only Rank Mods enabled (e.g., Speed, Flip).
3. **Unrank**: Leaderboard for scores with Unrank Mods enabled (e.g., DTB, Relax).
4. **Any**: Mixed leaderboard showing the highest score from either category.