You need three numbers to unlock the first of the three doors, and you'll find them when you solve the three puzzles on the paper.I will work to make the game experience better.
I solved the three number puzzle except for the number of candles, but there was no hint within the game as to lock was first and the order of the three numbers. I have checked the back of the paper of the three number puzzles and can't find a clue.
A hint of the puzzle next to the candles is on the table. Maybe this picture will help you. As I told you, I will make some modifications to make the puzzles easier to understand.