How smart is your geography knowledge?
Fun geography drill, but Seterra and Worldle already dominate this space.

Fun personality quiz dressed as cognitive mapping, but you'll only take it once.
Philosophy enthusiasts, curious general audience
16Personalities · Truity · OpenPsychometrics
Of course there are no correct answers. Each puzzle probes a genuine open question where smart people disagree.
Results are shareable via URL hash.
Curious how HN clusters in the space. Try it and share your coordinates.
Fun geography drill, but Seterra and Worldle already dominate this space.
15 years of bespoke math mechanics, but playable demos remain behind 'Preamble' link.
Math puzzle meets rolling-ball navigation with adaptive performance for older phones.
Visual demos make abstract math concepts click better than static textbooks.
Exploits Playdate's crank beautifully for KenKen, but audience is tiny.
The project grafts hexadecimal arithmetic onto a tiled crossword mechanic — you pick squares or shapes that represent a target hex number, with difficulty toggles, a timer, and an on-demand hint (press H). The UI is clean and immediately playable, but the core idea is a clever niche twist rather than a broad innovation; it could use better onboarding, scoring explanation, and shareable hooks to make it stick.