Game
FourLock — crack the code, outsmart your opponent
Each player hides a four-digit code. Two clues per guess — right place, right number — and the fewest guesses wins. Free, with no ads.
Inside the app
For anyone who likes a quick game of logic — on Android and iOS.
Modes
Three ways to play
Pass the phone to a friend, play a real-time duel online, or take on the computer at three levels.
- Pass and play
- Online duels with room codes
- Easy, Medium and Hard computer
Online
Real-time duels
Share a room code and play live — every guess appears for both players as it happens.
- Room codes
- Live guesses
- Match history
Clues
Two clues, every guess
Positions and Numbers tell you how close you are. Up to twenty attempts per round.
- Positions and Numbers
- Stats and streaks
- Learn in a minute
Why people use FourLock
For anyone who likes a quick game of logic — on Android and iOS. Built with Flutter · Dart · Fastify · PostgreSQL · WebSockets.
Play anyone
Local, online or against the computer.
Stats
Wins, streaks and best attempts.
No ads
Free to play, nothing in the way.
Quick rounds
A full duel in a few minutes.
Try FourLock
A four-digit code-breaking duel — play a friend, play online or beat the computer.
Visit fourlock.app