Method A: Subtract the sum of digits

1. Think of a 4‑digit number less than 8999. Keep it secret.
2. Add its digits. Example: 2341 → 2 + 3 + 4 + 1 = 10.
3. Subtract that sum from your original number. Example: 2341 − 10 = 2331.
4. Hide one digit from this final result. Enter the other three digits below, in any order.

Method B: Reverse & subtract

1. Think of a 4‑digit number with all digits different.
2. Reverse the digits to form a new number. Example: 2348 → 8432.
3. Subtract the smaller from the larger. Example: 8432 − 2348 = 6084.
4. Hide one digit from this result. Enter the other three digits below, in any order.

Enter the three visible digits