Keyboard Fighter: Power Arena
A free 2D fighting game that teaches your keyboard while you play. Charge ki, fire beams, ascend — and learn every key along the way.
Frequently asked questions
More free diagnostic tools
Press any key to verify it registers, measure hold time in milliseconds, and confirm N-Key Rollover — entirely in your browser, with zero data leaving your device.
Check your phone, tablet, or touchscreen laptop for multi-touch support, dead spots, and responsiveness — tap anywhere below with one or more fingers.
Check that your webcam works, preview your live video feed, and verify its resolution — all in your browser, with nothing ever uploaded or recorded.
Check that your microphone works and see your live input level — all in your browser, with nothing ever uploaded or recorded.
Check your monitor or display for dead pixels, stuck pixels, and backlight bleed by cycling through full-screen solid colors.
Type the passage below as quickly and accurately as you can to measure your typing speed in words per minute (WPM).
Check that your left and right speakers or headphone channels both work correctly by playing a test tone to each one individually.
Connect a controller and press any button to verify every input works — buttons, triggers, and both joysticks.