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The puzzle below begins in "edit puzzle" mode. Click on each square and type the letter you want to go there. To make a black square, type a space (' '). To enter a clue, first click on a word to select one of its letters, and then click on a clue box ("across" or "down") and type your clue. If you want to reverse the direction of a word in a Klein bottle puzzle, shift-click any letter in the word.
(Are you curious why you have to click on a square to select it, rather than just holding the mouse over it as on the previous page? The reason is that if you didn't have to click, then when you went to enter a clue, your square would get unselected.)
When your crossword puzzle is complete, change the menu at the right (below) from "edit puzzle" to "play puzzle", and challenge a friend to solve it!
[I'm sorry there's no way to save puzzles, but java's security restrictions don't allow that. If you want to save your puzzle, do it the old fashioned way: write it down on a scrap of paper.]