Making a Game on Excel

Making a game on Excel..
How can you make a game on Excel, through the use of conditional formatting and our friends, macros, you can make a simple game or a gorgeous one in a spreadsheet application just with the proper ideas and imagination.
We'll you should make good use of playing with color..
Changing the color fill of a cell, when it becomes the selected cell.
You can even make Minesweeper, or even Pokemon as long as you have the right use of these things.
Me, myself, tried to make Minesweeper but I felt small when I saw a man that made Monopoly out of that application on the internet.
So, what about you, could you make a cool game out of this spreadsheet application?