Hitori Puzzles Vol 1 contains many Hitori puzzles which one can solve it online. Rules to solve Hitori are given game itself. It contains around 30 puzzles of 3 different difficulty level. Once puzzle is solved, status of the puzzle is saved on your computer. Once you come back, it will list showing solved and unsolved puzzles.
One can also solve Daily Hitori puzzle online here on this website, along with other similar Logical Puzzles
Checkout Hitori puzzle Tutorial to learn Rules and basic techniques to solve this puzzle.