I like this type of simple memory game that gives me little dopamine boosts. For some levels if you miss the position of the 9 right at the beginning, it can become a game of luck since you'll be clicking around randomly to find it. I wish that when you clicked an incorrect number it made another flash of light of some kind. Otherwise simple and effective, I could see this placed inside of a larger game as a puzzle to represent cracking safes or something similar!