Puzzle Picnic contains an ever growing library of graded puzzles.
All are solvable on-line through your browser.
Instructions available in Dutch or English.
Search found 1102 matches
This link should be in every puzzler's bookmarks - Angela und Otto Janko There you will find a large collection of puzzles solvable online using their applets. eg, for Masyu, there are presently 260 graded puzzles to solve. They have also kindly offered a link to Google Translate to help with unders...