This document summarizes the development of a Tic Tac Toe game with different features and levels of difficulty. It describes how the original 3x3 game was expanded to a 4x4 version, and how single-player modes against the computer were implemented. Players can now select between Easy, Medium, and Hard difficulty levels when playing against the CPU. The development process involved understanding the original code, expanding the board size, modifying the winning conditions, adding CPU logic, and implementing a difficulty selection system.

1. Tic Tac Toe
Pengqia Chen, Yusuke Takeshita, & Gautam Butalia

2. Where we got the Original Program?

3. The Original Program

4. Program Development Planning
1. Understand the programs, change the JPanel color and Text information
about the constructor names and introduction of original program
2. Make the Tic Tac Toe from 3x3 to 4x4 (See Tic Tac Toe 4x4)
3. Understand the 3x3 players VS computer function (See Tic Tac Toe 3x3 v2)
4. Develop the 4x4 players VS computer function (See Tic Tac Toe 4x4 v2)
5. Develop the difficulty levels for players to play (Easy, Medium, and Difficult)

5. Basic Idea of the Program
1 2 3
4 5 6
7 8 9
Winning combos:
{1, 2, 3}, {4,5,6}, {7,8,9}, Horizontal Winning
{1,4,7}, {2, 5, 8}, {3, 6,9}, Vertical Winning
{7, 5,3}, {1,5,9}, Diagonal Winning
1 2 3
4 5 6
7 8 9

6. Editing: Instructions
After
Before

7. Editing: Author Names
Before
After:

8. Tic Tac Toe 4x4
1. Add more Jbutton to make the JButton from 9 to 16
Before:
After:

9. Tic Tac Toe 4x4.cont
1 2 3 4
5 6 7 8
9 10 11 12
13 14 15 16
Before:
2. Change the Winning Combos from 3 to 4
After:

10. Tic Tac Toe 4x4. conts
3. Change the checkWin class from 3 wonNumber to 4 wonNumber, for loop turns
from i< 7 to i< 9 because it has 10 winning combos
Before:

11. Tic Tac Toe 4x4. conts
After:

12. Tic Tac Toe 4x4. conts

13. Tic Tac Toe 3X3 Players VS Computer
Main Change:
Add the CPU class to make the computers be “smart” to figure out the winning
possibilities

14. Tic Tac Toe 3X3 Players VS Computer
O O 3
O O 6
O O 9
Return Jbutton 3, tell computer
to put an “O”
Return Jbutton 6, tell computer
to put an “O”
Return Jbutton 9, tell computer
to put an “O”
X X 3
X X 6
X X 9
Return Jbutton 3, tell computer
to put an “X”
Return Jbutton 6, tell computer
to put an “X”
Return Jbutton 9, tell computer
to put an “X”

15. Tic Tac Toe 3X3.V2

16. Tic Tac Toe 4X4 Players VS Computer
Main Change:
1 2 3 4
5 6 7 8
9 10 11 12
13 X X X
Return Jbutton 4, tell computer
to put an “O”O O O 4
5 6 7 8
9 10 11 12
13 14 15 16
Return Jbutton 4, tell computer
to put an “X”

17. Tic Tac Toe 4X4. V2
Add the level function: Easy, Medium, Hard
Medium
Hard
Easy

18. How to Play with Different Levels?
1. Players can select the Easy, Medium, and
Hard levels to play
1. Player can also click the player vs CPU
button to play, the program will randomly
select the level for you to play

19. The End