Brain Teaser 12 | Can You Find The Code To Open This Lock? - YouTube
What are the odds of guessing a 4-digit code? - Quora
Today's Puzzle #2 | Can you Crack the 4 Digit Code | Number lock puzzles @sharpyourmaths - YouTube
The most common pin numbers: is your bank account vulnerable? | Debit cards | The Guardian
PIN Cracker | Play PIN Cracker on PrimaryGames
CRACK THE 4 DIGIT CODE | If you crack the 4 digit code in 90 Seconds, you are a Genius - YouTube
ResQRoom - Crack the code challenge!!! A numerical lock has a 4 digit code. Find what is the right code. Its time to show your presence of mind. Comment fast!!! - - - - - #
Can you find the 4 digit code using the 5 clues? A mastermind-like puzzle : r/puzzles