Lighthouse Games Studio THE ULTIMATE REACTION TEST

HOLD STEADY. LIGHTS OUT. GO.

Three reactions.
One second.

Keep your nerve as the lights count down. When they go out, release, find the target and tap. Can your combined time beat one second?

Download on the App Store Get it on Google Play

Free to play on iPhone, iPad and Android. Contains ads and in-app purchases.

Explore the game features

Choose your store to get started.

THREE ROUNDS. ONE PERFECT SCORE.

01 / HOLD

Press the fingerprint pad.
Wait for the lights.

02 / REACT

Lights out. Release.
Find the target and tap.

03 / REPEAT

Complete three rounds.
Chase your fastest total.

CHASE THE NEXT PERSONAL BEST

1 Second Game features

A free reaction time game for iPhone, iPad and Android, inspired by the tension of an F1 starting grid. Test your reflexes over three rounds, sharpen your timing and see how you rank.

Daily leaderboards

A fresh day, another shot at the top. Set your fastest reaction and best three-round total on the daily leaderboards.

Weekly leaderboards

Put together your best run of the week. Compete for a place on the weekly rankings and keep chasing a lower time.

Overall leaderboards

See where you stand on the all-time leaderboards. Compare your fastest single reaction and combined three-round time with other players.

Achievements worth chasing

Join the 1 Second Club with a total under one second, earn Lightning Reflexes with a reaction under 0.3 seconds, and work towards consistency and clean-run milestones.

HDR visuals

Bright countdown lights, glowing targets and vivid sparks stand out against the dark neon racetrack. HDR output adds brighter highlights on compatible devices and displays.

F1-inspired sparks

Successful target hits send showers of glowing sparks across the screen. Racing-start lights and a moving neon track bring motorsport energy to the reaction challenge.

Up to 120 fps

Enjoy smooth motion and responsive play at up to 120 frames per second on supported devices. Actual frame rate depends on your device, display and power settings.

Sound and haptic feedback

Rising countdown tones build the tension, while hit sounds and optional haptics mark each reaction. Music and haptic controls let you choose how you play.

Personal bests and sharing

Track session records and saved personal bests, then share your fastest reaction and three-round total with friends. Give them a time to beat.

Quick rounds. Play anywhere.

Play rounds offline and choose from 20 language options. Connect to Game Center on iOS or Google Play Games on Android for online leaderboards and achievements. Online rankings require an internet connection and platform sign-in.

Download 1 Second Game