Sega MJ

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Revision as of 01:52, 27 August 2019 by Kator278 (talk | contribs) (Main Lobby)
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Sega MJ
SegaMJ logo.png
Sega MJ splash page
Publisher Sega
Platform PC, Android, iOS

Sega MJ is a mahjong platform by the game developer, Sega.

Basic user guide

Login screen

The client can be downloaded from the official site. It is available for Android, iOS, and Windows. Upon launching the client for the first time, after clicking through the splash screen and warning message, the following screen (or something similar) should be visible:

The Login Screen for Sega MJ
  1. The main Login button. The game automatically generates an MJM ID and password when it is first launched on a new device, which can be seen after clicking Login. If you have a SEGA ID, don't use this button yet.
  2. ID input. If you already have an MJM or SEGA ID, click this button to enter their details. They can then be saved for automatic login.
  3. Cache clear. This clears all the downloaded files for things like voice clips, table themes, and other images used by the game.
  4. Offline mode
  5. Privacy Policy. This will link to SEGA's webpage (in Japanese) where their privacy policy can be read.
  6. Website. Links to the main page of SEGA MJ.
  7. News. Also links to their website, but to the news section instead.

Creating an account

Creating an account is fairly straightforward. After logging in, the avatar can be customized and account settings initialized.

Create nickname.png Enter the public-facing nickname for the account here. If the name is valid, pressing Enter or clicking/touching outside of the entry box should show an "OK" button.

Select avatar.png Avatar selection. This selects the default character for the account.

Area of Japan.png Select which region of Japan the account should be associated with.

Final Agreement.png The final terms agreement, which states to play in a good manner and not to hack player data. The green button is to accept, and the red to cancel.

After accepting these terms, the main lobby should be launched. Some items may have to be downloaded. In general, the green button is to accept and the red button to cancel.

Main Lobby

The main lobby for Sega MJ.

Remember these terms as they will appear a lot:

  • Tonpuusen (東風戦): East wind only games. Sega abbreviates it often as tonpuu (東風) in their buttons.
  • Sanma (三麻): Three player games. These are hanchan (半荘) in which players play East and South rounds, but with only three players, so only three rounds per wind.
  • Hanchan (半荘): A new addition to SEGA MJ, these are East and South wind games.

Free Rooms

  1. Free play against other online players. Accounts can rise all the way to 1st dan in these rooms, but no higher.
  2. Play against CPU bots.
  3. Create a private room to invite friends to play.
  4. Training rooms to learn the basics and even some intermediate tactics through a structured lesson plan.


  1. The Casino, where MJ chips, Gold, and Casino chips can be spent on slots, video poker, and mahjong pachinko.

Ranking (paid) Rooms

  1. League. Always available, players can compete in a weekly league, with prizes being awarded to the top players in their randomly assigned division.
  2. Tournament. Players can compete in a 4-week long tournament with 4 stages, with the chance to face real riichi pros and chips being awarded to the top players in each stage. Late entry is permitted but costs Gold to do.
  3. Ikkyokusen. A single hand mode where chips/gold are paid to enter, and a jackpot is given to the winner of the hand based on the size of the hand.
  4. Gamble tables. For high rollers, a small house fee is collected on each game, but a large amount of chips are gambled. Sanma only, every point matters when determining payout.
  5. Event tables. Changes from week to week, but generally follows the same structure and offers limited time prizes for playing.


  1. Logout.
  2. Settings. Volume, level of effects, and more settings can be changed here.
  3. Mailbox. Certain winnings and other messages will be opened here.
  4. My Data. Stats on performance as well as current scores in each of the modes are available here.
  5. Replays.
  6. My Items. Inventory, where purchased items can be equipped.
  7. Shop. Purchase items that cannot be won from the gacha here.
  8. MJ Gacha. Try your luck with the many kinds of gacha here. One spin of the free gacha daily!

Reward system

External links