Koshin StudioWorks
Things made by one person: browser games, an iPhone app and a quiz.
Each page explains how the thing works, what it stores about you, and what is still unverified. The games need no sign-up and run in the browser. For how they were built and measured, see the development logs. The Japanese list is here.
Negaeri Shogi — a free 6×6 board game where sandwiched pieces defect
Negaeri Shogi is a free browser board game on a 6×6 board. Drop a piece to sandwich your opponent’s pieces: they defect to your side and get promoted, and chains flip many at once. Play locally, vs AI, or online with ratings.
Anime Type Quiz — find your anime type and the one anime that fits you
A free anime quiz. Answer 12 questions (up to 50), get your anime type from 6 axes (like RDCP-VM) and a nickname, and see your destined anime plus two runners-up chosen from over 6,000 real titles.
Toreca Dash (トレカダッシュ) — Japan TCG lottery, pre-order & restock alerts
An iPhone app that gathers lottery, pre-order and first-come sales of trading cards from stores across Japan, with a deadline calendar and alerts. Store information is mostly in Japanese.
Sushi Stack
Sushi Stack is a free browser merge puzzle. Drop rice, merge matching toppings up 11 tiers to reach the golden sushi tub. Online ranking, 14 languages, no install or sign-up.
Stop at exactly 10 seconds!
A free browser game: press start and count ten seconds in your head, with no numbers or sound on screen. Three modes, millisecond precision, and a fair daily ranking.