About the game
Open the vault by finding its hidden code. Choose three, four or five digits. Digits range from 0 to 9, and a code can start with zero. There is no limit on attempts.
After each check, ◆ shows how many digits are in the right place. ◇ shows how many other digits belong in the code but are in the wrong place. These counts do not identify the individual digits.
Easy: each digit appears at most once. Hard: each digit may appear twice. Tap a guessed digit after a check with an exact match to keep it for the next attempt; tap again to release it. Optional helpers reveal exact or misplaced digits. Each revealed digit counts as one hint. Aim for fewer attempts, fewer hints and less active time.