Descartes Rainbow is the sequel to Descartes Enigma.
It’s the same basic game idea, except that Descartes Rainbow (naturally
enough) supports multi-colored puzzles. Puzzles are constructed with
any of 12 different colors (black, gray, white, brown, red, orange,
yellow, green, cyan, blue, purple, and magenta). Most puzzles have
between 3 and 7 colors in them. The clues, of course, show you the
color of each block on a row or column as well as the number of squares
in the block. In Descartes Enigma, you knew that there was at least one
white (background) square between any two black (colored) blocks. In
Descartes Rainbow, the background color is not necessarily always white
(although that’s most common), and there may or may not be any
background colored squares between two adjacent colored blocks (unless
those two blocks are the same color, then there has to be at least one
background square between them, to keep them from being the same block).
ADDITIONAL RAINBOW PUZZLE SETS
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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.