マーダーミステリーパラドクスこのひと夏の十五年

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"Murder Mystery Paradox: Fifteen Years of Summer" is a text-based adventure game. Enter the remote and sparsely populated island of Shikinejima and attempt to solve the strangely recurring mystery found there.

Developer: 213℉
Publisher: Aniplex Inc.
Released: 1 Dec 2023
Price: $19.99
Platforms
Steam Deck: Playable
Languages: Japanese
Controller: Partial

Patch announcements

0 posts

Posts the developer tagged as patch notes

Last 90 days · as of 21 Oct, 02:03 UTC

How this is measured

Posts in a game's Steam news feed that Steam tags as patch notes.

News checked every 30 days. Observed since 21 Oct 2026.

An announcement is not a build. Developers can ship updates without a post, or post about several updates at once.
Each check keeps the 10 most recent posts. Quiet games are checked as rarely as monthly, so a very busy feed can have gaps, and posts from before our first check may be missing.

Source: Steam Web API, ISteamNews/GetNewsForApp. Full methodology

Announcements

“Murder Mystery Paradox: Fifteen Years of One Summer” – 2nd Anniversary!
2 Dec 2025 · Community Announcements
40% OFF Sale!
13 Mar 2025 · Community Announcements
40% OFF Sale!
3 Mar 2025 · Community Announcements
40% OFF Sale!
19 Dec 2024 · Community Announcements
The first anniversary of the release
2 Dec 2024 · Community Announcements
40% OFF Sale!
27 Nov 2024 · Community Announcements
Art book is now available!
28 Jun 2024 · Community Announcements
Now on sale at 30% off!
28 Jun 2024 · Community Announcements
30% off sale & "VEE" talent will be live streaming the event!
15 Mar 2024 · Community Announcements
Regarding the operation with Steam Deck (as of 12/4)
4 Dec 2023 · Community Announcements

From the game’s Steam news feed, last checked 21 Oct, 02:03 UTC. An announcement is not a build: games can update without posting. Every public build we saw is on the Builds tab.