OpenAI Game Builders Seoul brought 40 shortlisted teams together in Seoul on August 31 for a one-day, in-person event hosted by OpenAI and organized by Com2uS.
Teams presented and played the games they had built during the Online Warm-up Challenge. Game industry Legends and Special Guests also joined the event, sharing their creative processes, experiences, and perspectives on building games.
The day offered a closer look at how ideas take shape and become playable. It also showed the many ways Codex can support the creative process. Some builders used Codex to move from idea to prototype more quickly. Others used it to explore new features, interactions, and creative possibilities.
Build with Codex, Play with Hive
Many ways to bring ideas to life - Game industry Legends and vibe coders shared how they approach the creative process. The conversations explored where ideas begin, how they evolve through iteration, and how faster prototyping can open up new possibilities. Each speaker brought a distinct perspective. Some started with a clear direction, while others shaped their ideas by building, playing, and refining along the way. Codex also became part of each workflow in its own way, supporting a broad range of creative approaches.
Track 1. From Zero to One: Build with Codex
In Track 1, shortlisted teams presented the games they had created during the Online Warm-up Challenge. Each team representative shared a short elevator pitch and game demo, introducing the core idea, how Codex supported development, and how the game evolved along the way.
The submissions brought together a rich mix of genres, play styles, and development backgrounds. The focus was on how effectively Codex helped bring each idea to life as an engaging, playable game.
Track 1 Final Winners
Grand Prize
라벨렌 전기 : 겨울선 (뉴럴브레이크)
1st Place
등대섬 바다 이야기. (NullByte)
2nd Place
HAP (합) (합)
Honorable Mention
프리즌 퀸 (쎄씨바나나)
TIDESTEP 물때 (zzunkie)
우물 안 개구리: 원소술사의 탈출 (우물 밖 개구리)
오늘도 수상한 전당포 (오늘도 피곤한 팀원들)
온리스쿼트 (온리스쿼트)
Track 2 : Go Full Codex: 5 Hour Build
Track 2 began with a new theme revealed on site. Participants had only five hours to turn that theme into a playable browser game with Codex. The format encouraged fast experimentation : building, playing, refining, and continuing to shape the idea throughout the day.
For participants coming from Track 1, it was a fresh opportunity to explore a completely new direction.
The shared theme inspired an exciting range of ideas, interpretations, and creative approaches. Each builders found their own way to bring the theme to life with Codex.
Track 2 . "Go Limitless - Surprise me" Final Winners
AFTER CLEAR — 던전 사후처리반 (우마이 스튜디오)
OUT OF FRAME (NullByte)
여기, 코드 꽂을 데 있나요? (MKKPLAY)
From ideas to playable games - OpenAI Game Builders Seoul brought together a vibrant mix of ideas, creative perspectives, and approaches to building.
From experienced game developers to first-time builders, participants used Codex to move faster, explore further, and bring their ideas to life. Some built playable prototypes more quickly. Others expanded their ideas with new features and interactions. Across both tracks, the projects showed how much can happen when builders have more room to experiment and iterate.
Thank you to all the builders, industry Legends, Special Guests, and everyone who helped bring OpenAI Game Builders Seoul to life.
Build with Codex, Play with Hive.