I can't complete the twelth puzzle because I am not a master in a certain field. Is there any way to remedy this even though I have already completed all other puzzles?

You can look here for a description of the only way to train a builder after you've completed all of the construction projects. It depends a good deal upon luck, but it can be done.

How do u know the code without purchasing

The only way to legally get a code is to purchase the game. The registration codes are unique for each HotSync ID.

what do u do after the 2nd puzzle i can figure it out for the life of me

Most of the puzzles are dependent upon some combination of Village Tech, population, and other puzzles. The best thing to do is to keep your tribe healthy and fed, and continue to have them research new technologies. After every tech purchase, drag one of your adult villagers around the island and look for new things that they can work on.

lol about the registration code ..lol i just typed: 5 and it worked hehe

do someone know any cheats .. just wanna test:)

and one more thing .. how do i move the boulder?

This post contains several ways to get help with the puzzles in Village Sim.