Blog
Stories on games, wellness, and development — easy to fall into
Everything About Reaction Speed: What Grade Is Your Reflex?
From the science of reaction time to averages, grading, and influencing factors. Discover the reflex secrets of pro gamers and athletes, plus tips to improve.
4 min readFrom Gemini to Claude Code: Switching My AI Tool
After Gemini kept ignoring my project guidelines, I switched to Claude Code. Subagent architecture stabilized context management, and Slack notifications improved my workflow. The only downside: cost.
7 min readThe Science of Brain Training: How Games Awaken Your Mind
From neuroplasticity principles to training focus, memory, and mental math. Discover scientifically backed brain training methods and effective habits.
5 min readDigital Mindfulness: Starting Self-Understanding with Psychological Tests
Discover how mindfulness and psychological tests can deepen self-understanding amid modern stress. Learn practical digital wellbeing tips and short refresh routines for everyday life.
4 min readBuilding Chzzk Streaming Tools: Polls, Raffles, and a Promotion Attempt
An idea sparked by watching Chzzk streams. The story of building chat-integrated poll and raffle features, fixing the pain points of existing tools, and a promotion attempt that quietly fizzled out.
8 min readMigrating to Cloudflare R2: Moving Images Out of the Codebase
How the repository ballooned with images committed to code, why Cloudflare R2 was chosen, bulk migration with a script, and two unexpected issues — a local dev domain problem and a CORS cache bug — honestly documented.
7 min readApplying for Google AdSense: Two Rejections and an Ongoing Challenge
I decided that advertising was the only realistic monetization path for a psychology test and mini-game service. Here's the honest story of applying for Google AdSense, getting rejected twice, and still working on a solution.
7 min readCode Refactoring: How I Fixed the Problem of Running Out of Tokens in 2 Hours
After building several mini-games, the code was a mess and AI tokens were running out in just 2 hours. I share my honest experience of refactoring — writing tests first, then separating shared logic the way a backend developer would.
8 min readMini-Game Dev Log: From Lunchtime Colleagues to a Ranking System
After watching colleagues spend their entire lunch break retrying a reflex test, I decided to build my own. Here's an honest account of the problems that came up as games multiplied, how I added a ranking system with Firebase, and why the UI ended up inconsistent across games.
8 min readBuilding an AI Test Creation Guide: How I Realized Documentation Is Infrastructure
Building psychology tests with AI meant inconsistent quality. I tried creating a guide document to fix it — but when I asked AI how to build the guide, it fired back a barrage of questions. Then switching Gemini models made the document suddenly work. I can only guess why, but I learned a lot.
8 min readCloudflare Pages Deployment Story: What Happened When a Backend Developer Tried Static Hosting for the First Time
A backend developer who only knew server-based deployment tried static hosting for the first time. From choosing Cloudflare Pages to image optimization, routing, OG tags, and 404 pages — here's how each issue revealed itself only after deployment.
8 min readBuilding Psychology Tests with AI: What I Learned Starting Without Any Structure
It started with "just make me one" — no structure, no rules. Results were skewed, each test had a different tone, images were inconsistent. But I kept going. Here's what I learned building psychology tests with AI.
8 min readThe Birth of Q-Fit: A Backend Developer Building a Side Project with AI
An honest account of how a Java/Kotlin backend developer built the psychology test platform Q-Fit using AI coding tools — from the initial spark to development challenges and future plans.
7 min read