Numbers are always unique in the code, so it's not necessary to have same same number twice in the code, as you did with 1 and 2 in the first row, and 3 and 4 in the second row.
I usually start with 0, 1, 2, and 3. If all is red, I continue with 4, 5, 6, and 7. If a number is yellow, it means the number is correct but in a different spot. And if it's blue, you know the right number and spot.
If everything fails, and you still have a riddle key item, you can use it to skip the riddle.