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1st Part was dig all the graves out, then place the thing on the mark in front of the Hades statue.
2nd part had the Numbered stones you must place in an easy level Sudoku puzzle so that the corect solution is shown.
This type of puzzle can be found everywhere outside of the game. The rules are correct and every puzzle must be solved so that the set of nine pieces (1,2,3,4,5,6,7,8,9) can be found scrambled into each of the nine little boxes so that each row or colum across the three boxes is also the same set scrambled in whatever order fits.