🛠️ Portal 2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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9/30水🛠️ パッチ / アップデートPortal 2 - Update
An update has been released for Portal 2: - Security and exploit fixes reported via HackerOne. - Removed an obsolete URL from the Super 8 teaser.
2026年6月
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6/30火🛠️ パッチ / アップデートPortal 2 - Update
An update has been released for Portal 2. - Fixed failing to launch on Linux.
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6/26金🛠️ パッチ / アップデートPortal 2 - Update
An update has been released for Portal 2. - Fixed subtitles not playing during end credits. - Fixed not returning to the main menu when credits finish. - Security and exploit fixes reported via Hacker…
2025年2月
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2/6木🛠️ パッチ / アップデートPortal 2 - Update
An update has been released for Portal 2. - Fixed a compatibility issue that was causing a crash on Linux clients.
2025年1月
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1/21火🛠️ パッチ / アップデートPortal 2 - Update
An update has been released for Portal 2. - Fixed exploits used to crash remote players.
2024年6月
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6/25火🛠️ パッチ / アップデートPortal 2 - Update
An update has been released for Portal 2: - Fixed a remote code execution exploit and out-of-memory exploit in cooperative mode.
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6/4火🛠️ パッチ / アップデートPortal 2 - Update
An update has been released for Portal 2: - Fixed some exploits that could lead to crashes or remote code execution against a co-op partner. Reported via HackerOne.
2024年2月
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2/6火🛠️ パッチ / アップデートPortal 2 - Update
An update has been released for Portal 2. - Fixed the ping tool not working in co-op.
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2/3土🛠️ パッチ / アップデートPortal 2 - Update
An update has been released for Portal 2. - Fixed not being able to play local splitscreen.
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2/3土🛠️ パッチ / アップデートPortal 2 - Update
An update has been released for Portal 2. - Fixed several exploits that could crash a coop partner's game. All reported via HackerOne.
2024年1月
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1/6土🛠️ パッチ / アップデートPortal 2 - Update
- Fixed several remote code execution and crash exploits against co-op partners. All reported via HackerOne. - Fixed a regression in targeting some entities with the ping tool.
2023年4月
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4/27木🛠️ パッチ / アップデートPortal 2 - Update
An update has been released for Portal 2 and Portal 2 Authoring Tools. - Fixed several crash and remote code execution exploits, reported via HackerOne.
2023年3月
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3/26日🛠️ パッチ / アップデートPortal 2 - Update
An update has been released for Portal 2. - Fixed two remote player crash exploits. - Fixed a crash on launch that some uses were experiencing.
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3/15水🛠️ パッチ / アップデートPortal 2 - Update
An update has been released for Portal 2. - Fixed several remote code execution and crash exploits against co-op partners. All reported via HackerOne.
2023年1月
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1/18水🛠️ パッチ / アップデートPortal 2 Update
An update has been released for Portal 2 - Minor code maintenance, no customer-facing changes.
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。