I get it. Configurando teclado matricial no PICsim...ugh. I've been there. It's like trying to get a hyperactive toddler to focus. The whole "*" thing to mask the password... yeah, that sounds deceptively simple but it's a total headache to implement smoothly, right? It's almost as frustrating as accidentally tapping the wrong flappy bird pipe for the millionth time. Maybe try breaking it down into smaller, very manageable chunks? Focus on just reading the keypad first, then worry about the masking. Good luck, you've got this! I think... maybe.