Door Code is a free daily logic puzzle. Nobody remembers the code for the office door. All you have are a few codes that people tried, and how close each one was. Work out the real code from those clues and open the door. Monday is 3 digits. Friday is 5.
No sign-up and nothing to install. It runs in your browser on a computer or a phone, and your progress is saved on your device.
- Every digit is different. No digit appears twice in the code.
- Green and yellow dots. Green: a right digit in the right place. Yellow: a right digit in the wrong place.
- One answer. Exactly one code fits all the clues, and every clue is needed.
- Stuck? The lightbulb sets one digit for you. Hints and undo are free.
How to play Door Code
- Read the clue lines. Each one is a code that somebody tried, with dots that say how close it was.
- Rule digits out. A line with no dots means none of its digits is in the code.
- Use “Cross out” to mark the digits you have ruled out.
- Type the code and press Open. If it is wrong, the clues it breaks turn red.
How to read a clue
| Dots | What it means | What you can do with it |
|---|---|---|
| One green dot | One digit of that line is right and in the right place. | Try each digit of the line in its own place. |
| One yellow dot | One digit of that line is in the code, but in another place. | That digit moves. It cannot stay where it is. |
| No dots | None of those digits is in the code. | Cross them all out. |
| Grey dots | They only fill the row. A grey dot is a digit that is not in the code. | Count them: three digits and one green dot means two digits are out. |
Tips for breaking the code
- Start with the line that has no dots. It removes several digits at once.
- Compare two lines that share a digit. If the shared digit explains a dot in both, the other digits are out.
- Yellow tells you where a digit is not. Write down the places that are left.
- Count the digits that are still possible. When only as many are left as the code has places, all of them are in.
- Check before you press Open. Run your code against every line.
How the week gets harder
| Day | Code | Clues | What is new |
|---|---|---|---|
| Monday | 3 digits | 4 | One line has no right digit. |
| Tuesday | 3 digits | 4 or 5 | More lines to compare. |
| Wednesday | 4 digits | 5 | A longer code. |
| Thursday | 4 digits | 5 or 6 | Often no line without dots. |
| Friday | 5 digits | 6 | No line without dots. Every clue has to be combined. |
Saturday plays like a Wednesday and Sunday like a Tuesday.
Frequently asked questions
Is Door Code free?
Yes. There is no account, no download and no paywall.
Can a digit appear twice?
No. Every digit in the code is different, and so is every digit in each clue line.
Is there a limit on tries?
No. The game counts your tries, and a wrong code shows which clues it breaks.
Is it like Bulls and Cows?
The clues work the same way, but here you do not guess. All the clues are on the table from the start, and one code fits them all.
When does the new puzzle appear?
At midnight in your local time.
Can I play earlier puzzles?
Yes. Open the calendar button at the top of the game and pick any day from the past eight weeks.
Does it work on a phone?
Yes. On a phone, tap a clue to read it in words.
More to play on WiseChecker
- Browser Games: every WiseChecker game in one place.
- Clean Desk: remember the desk and find what is gone.
- No Blind Spots: place cameras so that no square is a blind spot.
- Cell Value: find the number behind every letter.
- File Pairs: turn over two cards and find the pairs.