Play Spider Online

I like sudoku spider, but I can not download anything, and I do not want to pay.

Yes, there are many and they are all very amusing.
Here are links to some.

http://www.websudoku.com/

http://www.pdfpad.com/sudoku/

http://www.sudokupuzz.com/

http://www.strictlysudoku.com/

http://www.free-sudokus.com/

~ Much and there are more, I hope this helps, if you want more, just go to google.com and type of sudoku free.