Your poorly optimizing. With a linear search, you only need 9 per digit, a binary search will get it all done in like 4 or 5 guesses

Batman

Username checks out. I'd expect nothing less from the DC world's greatest detective.

You can make a random number generator and start reading the numbers, if you can say them, you are right, easy, you don't even need to think at that point

No, no, no. You'll be blocked when you try to guess the wrong thing. You still have to try guessing on your won.