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!

1. Problem: Start from this position:

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

   and put the tiles in these positions:

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

   Solution: The answer is to obtain first the position below (which can be obtained, because it's an odd permutation):

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

   then, you must rotate the table by 90 deg. to the left:

   

   I hope you have notice the tiles are in the same positions like in the given image, and they are in the same order too (the trick is the numbers are rotated...).

2. Problem: Can you move the tiles so that the sum on the rows, columns or the two big diagonals to be always 30?

   Solution:

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

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