Picture Sudoku is surprisingly difficult to solve - without the sequence of numbers to help you remember what clue you are looking for it can slow you down - maybe it is better for visual learners! Here is the places you can find free online picture sudoku games to play
PictureSudoku.com has lots of different picture sudoku options, including flowers, cute animals, chinese and arabic letters and abstract shapes.
SuDocWho is a sudoku game from the BBC featuring the first 9 versions of Doctor Who (so no David Tennant or beyond - sorry!)
Claire's Sudoku Cute picture Sudoku from this Belgian website. The site is made in Flash so I can't translate it, but it looks like the pictures are characters from a series of Belgian comics.
Primary Games have a very well presented selection of picture sudoku games with themes including fruit, animals, colours, Halloween, Easter and Fall.
Sudoku Quotes and Tips The great thing about these puzzles is that they have to be solved by pure logic, not luck. They can be frustrating, but the reward when you crack them is a great feeling. Wayne Gould, Father of the current Sudoku craze.