The solution is unqiue, so there is only 1 possibility.
It is solvable by hand, but quite hard to do so.
Some people solved it by hand within 1 or 2 hours, which is very impressive to me.
Solving it by a programm might be difficult too, since a simple bruteforce might take very long.
Good Luck & Happy Challenging!
The geeks shall inherit the properties and methods of object earth.