This is a Logic puzzle  Inspired off the puzzle "The Brain"
not locked with a combination but with an algorithm.
the redstone in it isn't very complicated and a great way to learn the logic of red-stone.
it is made up of and gates and Toggle FlipFlops.

Note on the T Flipflops may need to be placed again by hand sense worldedit has issues with extened pistions.
It is in a schematic for easy placing.

If you would like to try it and don't have worldedit it is at the spawn on my server.  If you solve it on my server there is a prize.
So enjoy!
Happy Crafting
NeoBlade, The Minecraft MtnMan