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Rubik´s Fifteen (aka: XV) 
Here you find other
vintage computer collectors items.
Here you can buy an original Rubik's Fifteen in good
condition, actually unsoved (View the
photos) The game consists of two puzzles, one at
each side of the box. The tiles are moved by push buttons
from 2 sides of the box. Most of push buttons move a
column or row of tiles. One of the push buttons moves
3 rows of tiles all at once. No tile can be moved on
its own. Note that these are independent puzzles. Do
not try to complete both at the same time.
11,381,997,699,072,000
combinations  1 solution
The puzzle was patented by Ernö Rubik
on 18 September 1984, US
4,471,959, but there is an earlier Hungarian patent
from 1 September 1980, HU2154/80. Rubik's Fifteen is
inspired on the 15 Puzzle, which was invented in the
late 1870s by Sam Loyd. A related but much more difficult
puzzle is 'It'
/ Tsukuda's Square. Rubik's Fifteen is easier, because
it has more levers and therefore less restrictive movement
of the tiles.
 To solve the front side puzzle the Roman numerals
have to be arranged in sequence with the * filling
the last window in the corner of a 4 x 4 grid.
 To solve the reverse side puzzle, the numerals have
to form "Magic Square" of 15. That is to
say the sum total of the numbers in each row, each
column and each diagonal have to add up to exactly
15. Do not try to complete both at the same time.
I also sell an original Rubik´s:
Cube 
Tangle  Signed
Master Cube  Clock
 Babylon Tower
 Link Puzzler and
more!
The number of positions on Rubiks Fifteen:
Assume the levers are in one particular position.
There are 17 tiles, so there are at most 17! positions.
This limit is not reached because only even permutations
of the tiles are possible. This leaves 17!/2 = 177,843,714,048,000
positions for any particular position of the levers.
There are 6 levers with 2 possible states each, so there
are 26 possible lever positions. There are therefore
17!·25 = 11,381,997,699,072,000 positions all
together.
External links:
Rubiks Fifteen (aka: XV) 
Hier finden Sie meine anderen
Computer Sammlerstücke.
Rubik´s Fifteen, seltenes Mindgame, auch als
XV bekannt. Vom Erfinder des Zauberwürfels, Erno
Rubik.
Ich verkaufe auch noch Rubiks
Zauberwürfel
 Signierter
Master Cube 
Tangle  Clock
 Link Puzzler und
mehr!
Photos
Rubik´s Fifteen, unsolved  in good condition
