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Tesla Challenge 15: Handheld Tic Tac Toe

Subject: Product idea!
From: Carl Tesky <carl@longteng-co-ltd.gd.cn>

Hey y'all, I was just sitting around in the prototyping area designing some cool electronic games, when suddenly I got a perfect idea. Why not actually sell them and make money? These LCD displays don't use much power, they're cheap, and most retro-style games are easy to design. I'd suggest starting out with a tic-tac-toe game. You know, the good old "noughts and crosses".
I've created a simple multiplexer for a grid of buttons and I sent everyone the specifications for the display. It could have a tiny buzzer when players try to make a wrong move!

Subject: Re: Product idea!
From: 张杰 <zhangjie@longteng-co-ltd.gd.cn>

Carl, have you been using the prototyping board again?

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Small hint: Track the game's state in a RAM. The symbol a cell is occupied by does not matter.

Big hint: First check if a move is valid, then check which type of symbol will be written.

Optimization tip:

dgt 1

is your friend, however unlike in the smart refrigerator, you will need to special-case the reset button.