Fourth Boundary Launches Language Decoding ARG Shinsou: Okechika
The expanded release brings the PUB HUB-exclusive puzzles to a wider audience and offers a free translation function unlock for players who already own the Okechika Water item, extending the ARG's reach beyond its initial event.
Reporting from 1 source: Denfaminicogamer.
Fourth Boundary, the team behind Hito no Saifu and Kagami no Tokushu Shounen Koui Shisetsu, began selling the language decoding ARG Shinsou: Okechika on September 3. Players explore and translate real websites written in an unknown language to uncover secrets of a mysterious underground city called Okechika, where people involved reportedly disappear. The game is an expanded version of Okechika, released in February 2026, and includes all puzzles, including those previously exclusive to the British-style PUB HUB.
The expanded version carries a price of 4,980 yen (tax included) for the physical edition and 2,980 yen for the digital version. A separate purchase, the Puzzle Coaster, costs 1,800 yen (tax included) and lets players experience the HUB-exclusive puzzles. Both are available through the Fourth Boundary online shop.
For players who already bought Okechika Water, an important item in the original Okechika release, the translation function unlocks for free. The game includes a translation tool that supports decoding by letting players select text on real websites and replace it with Japanese in real time.
The core loop involves exploring the official website of the underground city, where decoding progresses gradually. Clearing a puzzle made up of 100 questions in total yields clues for further decoding. A new promotional video accompanied the release.
Synthesized by Yomimono from the 1 cited source below, including Japanese-language reporting where cited, then editorially reviewed before publishing.
Sources
- Denfaminicogamer 実在するWebサイトを紐解く言語解読ARG『真層：桶地下』が本当に謎言語過ぎる