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Sean Reidleft a comment
The idea started as a joke: what if CAPTCHAs were actually fun? Then I realized the core mechanic (solve a visual puzzle under time pressure) is basically a competitive game waiting to happen. The interesting technical challenge was making it cheat-proof. The CAPTCHA engine is Rust compiled to WASM. The server never sends images, just a seed number. Both the client and server independently...
CAPTCHA RoyaleRace to solve CAPTCHAs, last player standing wins
CAPTCHA Royale turns CAPTCHAs into a competitive multiplayer game. A Rust/WASM engine generates 12 CAPTCHA types across 4 difficulty tiers. No images transmitted, just seeds. Battle Royale: wrong answer eliminates you. Sprint: pure speed. ELO matchmaking on Cloudflare Workers.
CAPTCHA RoyaleRace to solve CAPTCHAs, last player standing wins
Orbit a black hole, fighting AI ships. Dive deep and your weapons hit harder, but the universe speeds up around you. Enemies orbit faster, fire more, reposition before you react. Climb out and you're safe but weak. Real orbital physics, beams that bend with spacetime, 6 gravity-aware weapons, AI that exploits time dilation against you. Runs in the browser, no install.
Gravity Well ArenaCombat game where time dilation is the core mechanic
Sean Reidleft a comment
Hey everyone. I built Gravity Well Arena because I wanted to see what happens when you take a real physics concept (Schwarzschild time dilation) and make it the central mechanic of a game instead of just a visual effect. The idea is simple: you're orbiting a black hole, fighting AI ships. The closer you get to the event horizon, the slower your proper time runs relative to the universe. From...
Gravity Well ArenaCombat game where time dilation is the core mechanic
FLOW runs entirely client-side — no server, no account, no uploads. It parses 13 file formats natively in the browser, including MOBI/AZW via a hand-rolled PalmDOC decompressor, EPUB, PDF, DOCX, and Markdown. No competitor does that without a backend. The speed ramp engine uses a cubic ease-in curve (120→650 WPM) that mirrors how reading cognition actually works, paired with optical pivot highlighting on each word's focal letter. Zero config, drag-and-drop, light/dark themes, fully private.
FLOW Speed ReaderLet the text FLOW through you
Sean Reidleft a comment
Hey PH! I built FLOW because every speed reader I tried either wanted me to paste plain text or sign up for an account just to read my own files. FLOW runs 100% in your browser. Drop an EPUB, PDF, MOBI, Markdown, DOCX (13 formats total) and it starts flashing words using RSVP. No server ever sees your books. The part I'm proudest of: the speed ramp. Instead of a fixed WPM, it eases you from 120...
FLOW Speed ReaderLet the text FLOW through you