🛠️ Mahjong Soulのアップデート履歴
開発元がSteamで公開した公式告知（パッチ、新コンテンツ、イベント）を時系列でまとめています。タイトルをクリックすると全文を読めます。
2026年9月
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9/23水📢 お知らせWhimsy Machine Limited-Time Events
1. New Event: Whimsy Machine1) Event Period: 9/22 after maintenance – 10/8 1:59 P.M. (UTC-7);2) The event page will update event missions every day at 2:00 P.M. (UTC-7). Complete event missions to get…
2026年8月
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8/19水📢 お知らせBeachside Cabana Limited-Time Events
1. New Event: Beachside Cabana1) Event Period: 8/18 After maintenance – 9/8 1:59 P.M. (UTC-7);2) Event Details: During the event, complete missions to earn exciting rewards, including Limited Title, L…
2026年7月
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7/22水📢 お知らせWinged Slumber Limited-Time Events
1. New Event: Winged Slumber1) Event Period: 7/21 After maintenance – 8/4 1:59 P.M. (UTC-7); 2) Reward Redemption Period: 7/21 After maintenance – 8/6 1:59 P.M. (UTC-7); 3) Event Details: The event pa…
2026年6月
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6/17水📢 お知らせAKAGI X Mahjong Soul Collab Rerun
1. New Event - The Night of Legends: Shadows Reborn1) Event Period: 6/16 After maintenance - 7/7 1:59 P.M. (UTC-7);2) Event Details: The legendary night returns, bringing with it the highly anticipate…
2026年5月
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5/28木📢 お知らせ[Sky-High Ambition: Finders Kitties] Limited-Time Events
1. New Event: Sky-High Ambition: Finders Kitties1) Event Period: Available for a long time after maintenance on 5/27;2) Mission Period: 5/27 After maintenance – 6/10 1:59 P.M. (UTC-7);3) Event Details…
2026年4月
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4/22水📢 お知らせMahjong Soul X Sword Art Online Collab
1. New Event: Oath of the Sword1) Event Period: 4/21 After maintenance - 5/12 1:59 P.M. (UTC-7); 2) Event Details: Link established. Data initialization complete. The portal to the floating island is …
2026年3月
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3/25水📢 お知らせSoft Night, Sweet Petals Limited-Time Events
1. New Event: Soft Night, Sweet Petals1) Event Period: 3/24 After maintenance – 4/7 1:59 P.M. (UTC-7);2) Event Details: During the event, the event page would update event missions every day at 2:00 P…
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3/10火
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3/5木📢 お知らせ[Important] Yostar Account Binding Reminder
Binding InstructionsThe Yostar Account system will be available after the server maintenance on March 9th, 2026 (UTC-7). Following this update, only the new Yostar Account system will be supported for…
2026年2月
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2/11水📢 お知らせWishes Unbridled Limited-Time Events
1. New Event: Wishes Unbridled1) Event Period: 2/10 after maintenance – 3/6 1:59 P.M. (UTC-7)2) Event Details: To gather wishes and hone her skills, Chi Lin, Lady of the Horse Palace, is dashing throu…
2026年1月
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1/14水📢 お知らせMia's Channel Limited-Time Events
1. New Event: Mia's Channel1) Event Period: 1/13 - 1/27 1:59 P.M. (UTC-7);2) Event Details: During the event, log in daily and complete missions to obtain event items. Gift these items in Mia's stream…
2025年12月
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12/17水📢 お知らせSnowball Brawl Limited-Time Events
1. New Event: Snowball Brawl 1) Event Period: 12/16 After maintenance - 1/12 1:59 P.M. (UTC-7) 2) Event Details: Chaos descends on the winter dream – intruders have entered the snowy secret garden! Re…
2025年11月
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11/19水📢 お知らせHibiki's Console Limited-Time Events
1. New Event: Hibiki's Console 1) Event Period: 11/18 After maintenance – 12/2 1:59 P.M. (UTC-7); 2) Event Details: During the event, log in daily and complete event missions to earn Ammo. Use the joy…
2025年10月
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10/22水📢 お知らせMahjong Soul X Gintama Collab
1. New Event: Ichihime's Odd Jobs 1) Event Period: 10/21 After maintenance - 11/11 1:59 P.M. (UTC-7); 2) Event Details: A new Odd Jobs business is opening in One Han City, and its owner is none other …
2025年9月
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9/24水📢 お知らせWhen the Wind Gusts Limited-Time Events
1. New Event: When the Wind Gusts 1) Event Period: 9/23 After maintenance – 10/9 1:59 P.M. (UTC-7); 2) Event Details: During the event, the event page would update event missions every day at 2:00 P.M…
出典：Steam公式告知（6～24時間ごとに更新）。タイトルと概要の著作権は各開発元に帰属します。