Greek Squares is a game of logic and deduction. It has 10 different puzzle "layouts", 3 of which are standard Sudoku puzzles
(9x9, 12x12, and 16x16). The other 7 layouts use irregularly shaped tiles, which provide more interesting deductions than are possible in
standard Sudoku puzzles. The goal is to place one of each of the numbers into each row, column and tile. Each puzzle is guaranteed to
have one and only one solution. The game places some numbers for you at the start of the puzzle. Using those (and the
knowledge that there can be only one of each number in each row, column and tile) you remove possibilities from the puzzle until you can place
numbers where they must be located. The game also supports entering the clues from standard 9x9 and 16x16 Sudoku puzzles as they appear in
newspapers and magazines so that you can solve them on the computer rather than with pencil and paper. The game also lets you print out the
puzzles for solving by pencil when you're away from your computer. The game includes tens of thousands of different puzzles, enough to keep
you busy until you go crazy from seeing squares...
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The demo and licensed versions are identical, except that the demo version has limited numbers of puzzles, and the licensed version may have additional support files (like extra image sets). So, if the demo version works for you, the licensed version will, too. If the demo version doesn't work for you, neither will the licensed version.
Generally, you don't need to un-install a demo version before installing the licensed version. The licensed version will install right over the top of the demo version and use all of the settings you've already created with the demo version.
NOTE: You can not upgrade your licensed version by installing a newer demo version over the top of the licensed version. You would just end up with a demo version.