Here is an online sudoku with colors instead of numbers. I have a couple of problems doing these, due to the lack of a natural order. First, I can't say to myself, "I've done the ones and twos, time to check the threes." Second, I can't count off a row or column to find the missing numbers.
I also notice that my internal dialog is more difficult. The words for one through nine are all one syllable, except for seven. Dark green, light green, orange, yellow... colors take more syllables. Or maybe, being a computer nerd, words, numbers and mouse clicks are all left-brain for me, while colors are right-brain. Whatever the reason, I have trouble working these.
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