In the project's 2 person games there will usually be a computer player implemented, too. In general the computer will supervise and check that game play follows the correct rule set, e.g. as offered in the single person fifteen puzzle game.
As a first game of this collection you will find an Android implementation of the popular 15 puzzle (also well known as sliding puzzle or sliding tile puzzle as invented by Noyes Palmer Chapman around 1880).
Have fun playing...