solo developer 128
- Three Card Games Almost Shipped Without Card Images — Sorting Out a Shared Deck, a Rotation Module and Landscape Layouts in One Pass
- I Put the Same Logo Badge in the Same Corner of 76 App Icons — The Series Spec Set on the Day a Text-Only Icon Got Rejected
- Re-Measuring All 100 Box Push Levels with a Solver, and Why I Decided Not to Build Level 101
- 157 of My 200 Korean Posts Are Not Indexed — The Side Effect of September's URL Switch and What I Am Doing About It
- How I Built a 7,200-Question Exam Bank with AI Agents — Separate Writers and Reviewers, and the Source Documents I Should Have Read First
- How I Bundled 50 Games into 9 Hub Apps Without Touching a Line of Game Code — Multi-Page Bundles and One Global Flag
- Moving Hub Apps onto Apps in Toss — Why I Withdrew the Shutdowns and Rewrote Existing Apps Instead
- FDK Olympics — Mini Golf, Pool and Pixel Pong in One App
- FDK Brain Check — Five Daily Games for Words, Memory and Reaction
- FDK Board Duel — 16 Board Games Including Janggi, Go and Gomoku
- FDK Arcade — 7 Classic Arcade Games and a Weekly League
- Ad Revenue Keeps Falling After the Apps in Toss Exposure Overhaul — What Dropped Was One App's "All Tab" New Users
- AdSense Rejected Again — I Fixed the Sitemap and Wrote 51 More Posts, and the Result Was the Same
- Tap Bird Was Picked for the Apps in Toss Partner Growth Program — Two Days Turning a "One-Round Game" Into One Worth Coming Back To
- Spider Solitaire — Build King-to-Ace Runs in One Suit
- Pyramid Solitaire — Pair Cards That Add Up to 13
- FDK Puzzle Cafe — 11 Puzzles and 3 Daily Missions in One App
- Hoop Shot — A 60-Second Flick-to-Shoot Basketball Challenge
- Daily Korean Spelling — One Korean Spelling Question a Day
- Running Three AI Sessions in Parallel Did the Same Job Twice and Overwrote Each Other's Records — Why Session Management Stays With the Human
- The First Outside Library in My Monorepo, the planck Physics Engine — Decisions Made Building Castle Topple
- One Week After Launching 14 Games on the Same Day — Closing a Launch With D+1 and D+7 Checks
- An Apps in Toss Workspace Holds Only 50 Mini Apps — Getting Stuck at Number 51
- Syncing a Local HTML Checklist With a JSON File, No Server — Letting a Human and an AI Write the Same File With the File System Access API
- 27 Languages Were Inheriting the English Screenshots — The Pipeline That Shot and Uploaded 43 Japanese Screenshots
- Rewriting 45 Japanese Store Listings From Machine Translation to Real Japanese — Genre Words in Titles and Avoiding Trademarks
- The Toss "Ad Notice" Rejection — Toasts and Notices Both Failed, and Only One Layout Passed
- Ultimate Tic-Tac-Toe — Nine Small Boards
- Nine Men's Morris — Line Up Three to Remove Pieces
- Hex — Link Your Two Sides of the Hex Board First
- Backgammon — The Classic Dice Board Game
- Amazons — Move a Queen, Shoot an Arrow, Block a Square
- All Four Rejected by CrazyGames — I Am Stopping Here
- Five Games That Need No Words — Looking Back on the Retro Five Launch
- Back to CrazyGames — After Three Rejections, One New Game Submitted as "Siege King"
- I Submitted Three Games to CrazyGames and All Three Were Rejected the Same Day — Plus How I Got Hooked on Ragdoll Archers
- Adding Play Console "Tags" to 53 Apps in a Day — Automating a Menu That Has No API
- Applying for the Google Play Games on PC "Playable" Badge — How I Checked 52 Games on the Emulator in One Day
- Nine Board Games on One Engine — Looking Back on the Eight Days to the October 9 Launch
- One Shared CSS Class Name Broke the Exit Dialog in Two Games — A .sheet Collision
- More Modes, Not More Apps — Looking Back on Reaction Challenge's Eight Modes
- I Added Google Play Games Leaderboards to 22 Games, Then Removed 20 — One Place in Code, Blocked by the Cloud Project Limit
- When Several AI Coding Sessions Share One Repo, Git Breaks Like This — 17 Games Shipped, Never Committed
- Quick Go — Go from 9×9 to 19×19
- Mini Golf — Pull Back and Putt
- Billiards — 8-Ball to Four-Ball and 3-Cushion
- First Apps in Toss Registration in One Pass — Submitting 14 Games with Combined App Info and Bundle Review
- Castle Topple — Cannon Physics Puzzle
- Korean Particles Broke My Quiz App — 310 of 700 Answers Got the Wrong Ending
- Toss 1-Won Promotion, Week One — 2,099 Won Spent, and Ad Revenue per Won Was All Over the Place
- AdSense Rejected My Site for Low-Value Content — 600 of 954 Sitemap URLs Were Empty Pages
- Yut Nori — Korean Board Game
- Sea Battle — Sink the Fleet
- Reversi — Classic Board Game
- Merge Pop — Drop & Merge
- Mancala — Sow and Capture
- Make Ten — Number Puzzle
- Janggi — Korean Chess
- Gonu — Korean Board Games
- Four in a Row — Classic Game
- Dots and Boxes — Classic Game
- Checkers — Classic Board Game
- Bubble Pop — Aim & Match 3
- Box Push — Brain Puzzle
- Block Fill — Line Clear Puzzle
- Math Monsters Is Now a Google Play 'Teacher Approved' App
- The Revenue Ledger, Three Weeks On — Toss and Play Ad Revenue and 1 KRW Promotions in One Command
- We Put a 1 KRW Promotion on the Toss Benefits Tab — 26 Mini Apps, 3,000 KRW Each
- When to Ask for a Rating — One Review-Prompt Rule for Toss and Google Play
- Save Instead of Lotto — What the Same Money Would Be Worth
- Searching Backwards for the Birth Charts and Plates That Made Last Week's Lotto Numbers
- Name Lotto — Numbers From the Five Elements in Your Name
- Star Sign Lotto — Numbers From Your Zodiac
- Car Number Lotto — Numbers From Your Plate
- Daily Money Quiz — One Question a Day
- Daily Korean History — One Question a Day
- My Ad Account Was Suspended 29 Days for Invalid Traffic — The Culprit Was My Own Dev Phone
- Apps in Toss Is Changing How Mini Apps Get Found — Notes From the PO Webinar
- Sequence Memory — Watch the Lights, Repeat the Order
- Mole Tap — Sixty Seconds of Reflexes
- Fixing a "Cold Start Over 20 Seconds" Rejection Twice — 20 Seconds Is When the Screen Stops Moving
- Turning 27 Games Into Reels — 1.5x Speed, 9:16, and Links That Do Not Click
- Sky Jump — Climb Forever, One Platform at a Time
- Rock Paper Scissors — Streaks Against an AI That Reads You
- Tower Stack — One Tap, One Floor
- Pixel Pong — One-on-One Against the AI or a Friend
- Number Slide — The 15 Puzzle, With Pictures
- Traffic Never Comes Through One Door — Opening 54 Paths on Instagram and YouTube
- I Moved the Play Console Clicking to the API — 121 Locale Slots and a One-Line Release
- Snake — Eat, Grow, Try Not to Bite Yourself
- Adding Record Tabs to a Leaderboard With No Read API — 20 Mini Games
- Checking 27 Apps by Hand Every Morning, Until I Built a Ledger
- Gomoku — First to Five in a Row
- Adding Hearts to Games With Nowhere to Put a Rewarded Ad
- Brick Breaker — Bounce, Break, Repeat
- Solitaire — The Klondike You Already Know
- 14 Mini Apps, 13,365 KRW in Four Weeks — My Full Ad Revenue Numbers
- Why the Consent Sheet Never Appeared — I Wrote the Rule Down and Never Applied It to the Existing Apps
- Minesweeper — Read the Numbers, Avoid the Mines
- 2048 — Slide and Merge Your Way to the 2048 Tile
- The Code Said "Not Supported" — It Had Been Working All Along
- I Shipped Ten Mini Games With No Ads — The Apps Were Done, the Ad Slots Were Never Created
- Apps in Toss Policy Changes for September and October — A Partner's Checklist
- Apps in Toss Functional Push — Three Weeks of Mistakes, Written Down
- Hangul Monsters and Math Monsters Are Now Completely Free
- Shipping Six Mini Games at Once — A Five-Day Retrospective
- Number Rush — Tap 1 to 25 in Order as Fast as You Can
- Tap Bird — A One-Finger Arcade Flight Through the Gaps
- Hangul Word Guess — A Korean Wordle Played One Jamo at a Time
- All Lights Off — The Classic Toggle Puzzle With Daily Boards
- Nonogram — Reveal Hidden Pixel Art With Number Clues
- Sudoku — A Clean Daily Sudoku With Four Difficulties
- The Day We Quit Kumon, Dad Started Building a Math Game
- Retiring Flutter — What I Learned Rewriting Three Apps for the Web
- 8 Traps I Hit Making This Blog Bilingual (Jekyll + Chirpy)
- Tarot Ping — Cute Pastel Mascot Deck Tarot Reading App
- Tarot Fortune — One-Card Tarot Reading App for 12 Themes
- What I Learned Shipping 8 Apps as a Solo Dev with a Day Job
- Math Monsters — A Math Practice Game Where Kids Catch Monsters
- Nursing Assistant Mock Exam — 2,400+ Original Practice Questions
- Hangul Monsters — A Listen-and-Speak Korean Alphabet Game for Kids
- Memory Cards — Match the Pairs, Against the Clock
- Reaction Challenge — 8 Reflex Challenges
- Apps in Toss Launch — Saju Lotto, Juice Spinner & Spin the Bottle
- Saju Lotto — This Week's Numbers from Your Birth Chart
- Juice Spinner — Who Buys the Juice?
- Spin the Bottle — One Round to Settle the Table
- The Road to My First App Launch — Business, Domain, Site and Costs