Gaeyeonsi: Dev Decision Sim

2 a.m. Payments are down. Dig through logs and metrics, find the cause, and make call after call to bring the service back. Every choice changes the ending.

Gaeyeonsi is a pixel-art, choice-driven simulation game about responding to real-world IT outages.

2 a.m. Payments are down. Alerts keep firing and your team lead wants answers. You are the engineer on the incident. Dig through logs and metrics, and make one call after another with limited time and incomplete information. This is not a quiz with a single right answer: every choice has a reason and a cost, and it changes the clues you get, what happens next, and how it ends.

■ How it plays • Read the dialogue and pick your move, like a visual novel • Investigate realistic logs, metrics and code for clues • Payment failures, bad deploys, data loss and other incidents you could meet at work • Episodes by role: backend, frontend, infrastructure, mobile, data, game development and more • Difficulty from new grad to senior

■ What you get at the end • Multiple endings: the same outage ends differently depending on how you respond • An engineering evaluation and a technical postmortem report • Compare your score with other players • Share your result as an image

■ No strings attached • Play right away without logging in; log in to save your records • Sign-up never asks for your email, phone number or real name (only a login ID, nickname, role and career level) • No ads, no in-app purchases • No permission requests: no camera, location, contacts or notifications • 한국어 / English

■ Community Report a bug, or suggest an outage you lived through as a new episode.

Contact: privacy@gaeyeonsi.com