About Reflex Slayer
Reflex Slayer is a single-player browser game built around one question: how fast are you?
Tap when the screen flashes red. The game measures your reaction time in milliseconds and ranks you on a seven-tier scale, from Slow Turtle to God Reflex.
Three modes
- Classic — 10 reactions, average decides your rank.
- Survival — one reaction slower than 500 ms ends the run.
- Boss Fight — drain a 5000 HP boss before your own 1000 HP runs out. Slow reactions deal counter-damage to you.
Free, anonymous, account-free
No signup. No password. No email. A random cookie tracks your runs on this browser, and you can wipe everything from Settings any time.
Built with
Flask + SQLite on the backend, vanilla JS on the front. No bundler, no framework. The source of truth for game tuning lives in a single config file so balance is easy to change.