In this website you will find logical games, mind games, brain games. This one is an online game, but you will find soon, some totally new and original logical games!

Everybody knows this logical game's purpose: the player has to order the tiles like this:

1	2	3	4
5	6	7	8
9	10	11	12
13	14	15

You can play online Sam Lloyd's "15" puzzle here.

Sam Lloyd (1841-1911) launched a problem: can you solve the game, if initially the tiles are arranged like in the image below?

1	2	3	4
5	6	7	8
9	10	11	12
13	15	14

This problem is known as "The 15-14 problem" and the author offered a thousand dollars to the one who will solve it.

A lot of people tried to solve the puzzle, but nobody claimed yet the prize.

You can find why Sam Lloyd didn't risk anything here, where we discuss the mathematics of this logical game.

Good news!!! If at the beginning the tiles are disposed like in the second picture, and we want to arrange them in the same order like the first image, we can do this!!! The problem has solution!!! Click here to see it!

1. Play online Sam Lloyd's "15" puzzle
2. The funny story of this game
3. Mathematical implications of this game
4. Some funny logical problems with the 15 game.