A famous aviator vanished over the Pacific. A detective with a splitting headache and the pilot’s daughter are on the case. Korean two-person indie developer CONCODE has released a new trailer for its mystery action adventure Graytail and locked in a late-2027 release.
CONCODE premiered the new footage at the ID@Xbox x IGN Showcase on October 20 (local time). The trailer highlights the game’s distinctive 2.5D presentation and offers the first in-game look at Chapter 3, currently in active development.
The same day, the studio announced it has secured development funding from Outersloth, the indie game fund run by Among Us developer Innersloth. Outersloth is a creator-first fund that guarantees developers full ownership of their IP and creative direction.
A 2.5D Trailer and the First Look at Chapter 3
The new trailer leads with the game’s 2.5D visuals and shows scenes from the third chapter for the first time. In development at CONCODE for about four years, Graytail is a mystery action adventure inspired by the Legend of Zelda series.
The story begins with the search for a famous female pilot who disappeared over the Pacific. A detective plagued by terrible headaches teams up with the pilot’s daughter to investigate.
Players fight with a cane as their main weapon, supplemented by secondary tools such as an umbrella and a frisbee. They ride a motorbike across five regions and combine weapons with objects in the environment to solve puzzles.
Outersloth Funding, With Slay the Spire’s Casey Yano Onboard
Outersloth funds developers so they can finish their games while retaining their IP and creative direction.
Joining Outersloth in this round are Casey Yano of Mega Crit Games, creator of Slay the Spire, and an undisclosed investment partner. Because this is funding rather than a publishing deal, CONCODE will release Graytail itself.
CONCODE co-founder Shin Myung-jin said he was surprised by how quickly Outersloth decided to invest after their meeting. “They were the partner we wanted to work with most from the very beginning,” he said, adding that the funding is especially meaningful because it lets the team keep developing while also gaining experience self-publishing.
50,000 Wishlists and a 98% “Very Positive” Demo
Graytail won Best Mobile Game at the Indie Game Award 2026, hosted by Taipei Game Show. The competition drew 515 teams from 51 countries and regions, and organizers praised the game’s smooth storytelling and elegant visual style.
The game currently has 50,000 Steam wishlists, and its demo holds a “Very Positive” rating (98%) from Steam users. With the new funding, CONCODE plans to improve the combat system and deepen the story and each region.
The current demo will end in November 2026, and a new demo featuring the reworked combat will follow. Shin explained that the release was set for late 2027 to give the team time to refine combat and raise overall quality. Versions for other platforms will follow later.
The Korean Duo Behind The Way Home
Founded in 2021, CONCODE is a two-person indie studio in Korea. Co-founder Shin Myung-jin handles programming and narrative, while co-founder Kim Sun-hyang handles art and animation.
CONCODE’s first game, the mobile story game The Way Home (집에갈고양), has surpassed 3.5 million downloads with a 4.7 rating. The two developers handle every part of production themselves, from design and development to art and release.
Graytail is scheduled for release on PC and Xbox in late 2027. The current demo ends in November, with a new combat-focused demo on the way. The game can be wishlisted on Steam and the Xbox Store.
Who This Is For
Strong fit for: fans of Zelda-style action adventures with exploration and environmental puzzles; players who love detective stories and mysteries; anyone drawn to striking 2.5D presentation; Xbox players; supporters of creator-owned indie projects.
Cautious fit for: players who want to play soon, as the full release is over a year away and the current demo ends next month.
What to Watch For
The new demo with reworked combat will be the key milestone, showing how CONCODE uses its funding to deepen the area the team itself identified as needing the most work. Keep an eye on which additional platforms are announced after the PC and Xbox launch.
The Takeaway
Graytail is a standout success story for Korean indie development: a two-person team with a 3.5-million-download mobile hit behind it, now backed by Outersloth and Slay the Spire’s Casey Yano, showcased by ID@Xbox and IGN, and recognized in Taipei, all without giving up its IP. With 50,000 wishlists and a 98% positive demo, CONCODE has earned the time it’s taking to make the combat match the charm.
Wishlist now on Steam and the Xbox Store. Release: late 2027.
Information regarding ‘Graytail’
| item | detail |
|---|---|
| Game name | Graytail |
| Genre | Mystery Action Adventure |
| Developer | Concord |
| Funding | Outersloth |
| platform | PC (Steam), Xbox Series X |
| Release date | Scheduled for late 2027 |
| Trial version | The existing demo will end in November 2026, and a demo featuring new combat will be released later. |
| Steam Page | Shortcut |
| Xbox Store | Shortcut |
