Hey, I've been doing Tic Tac Toe games which currently holds player vs. player mode.
But now the game should be turned on player vs. computer (would use a random generator not computer)
Can it be written easily over this or should I start new one?

ya it'd be super easy just make a 3x3x2 array for positions (3x3 board x2 old/new position)
you could make a difficulty slider too pretty easily that held % chance of choosing the best move
make it so it always defends a 3 in a row first
if there isnt a 3 in a row use the odds to pick between random or best move

Thanks for response. I made new Tic Tac Toe which asks size of it and how many marks for win.
I got everything setup expect the check if someone wins, will be looking forward.