I made a game one time about a year ago when I was in college. I took some computer programming class. It was simple... Tic-Tac-Toe. The program would pick which square to put its "X" in by multiplying a number where one of the multiples was 3 and then dividing by a number, and the number it would be divided by would be 3, 6, 9, 12, 15, 18, and so on... All multiples of three. Well, depending on the resulting number it would determine which square to put its "X" in. And the beginning number would always start on 3 and multiply it by whichever number square the "human" oppenent picked, and go all the way up to 99 and start over again... That's why the game wouldn't start until the "human" opponent picked a square. It was an easily beatable game if you knew the program or if you watched where the program would put the "X" everytime, and then would see it always corresponded to your number... I can't remember what system or code thingy I used... I quit college 2 months into it cause it seemed like I was taking highschool over again. But I remember I got a 100 for the grade for making my own game, even if it was shitty and simple.