A visually interesting mashup of Sudoku and Flickr involving pictures of numbers is shown in Flickr Sudoku. This is an online playable game, (although rendering for the Safari 1.3.2 browser is flawed at the bottom).
Unfortunately, the presentation reminds me of a numerical ransom note. This is not to minimize the great work that went into creating this site. I also like the various (random) Sudoku keyword searches on Google shown at the top. There’s a Time of Day Site called Human Clock that has found and created objects/photos with the correct hour and minute that uses a similar idea.
A more abstract version of the same concept is shown on Becky’s Web where 9 thematically grouped pictures and a blank picture are shown in a playable grid. Like the large varieties of layouts in Mah Jong Solitaire Software Puzzles, the original chinese characters are transformed into various alternative symbol sets.
I believe it is a good idea, when exercising the brain, to expose it to a variety of “settings” or contexts in which puzzle solving logic can be applied. The brain embraces the novelty and adapts to a more flexible solving environment.
Thanks to Webmaster for letting me know about these sites.