When you complete a crossword, it will turn green as seen in the picture below:

Please note that some crosswords are not in strict mode and therefore you are able to check for wrong entries or even reveal entries. If you do this, you will not get points for completing the crossword.
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For crosswords that are still in strict mode, you can log in or create an account to get 5 free coins. You can use these coins to check or reveal entries of the crossword and still earn points and new coins when you complete the crossword. Head over to our coins documentation for more information.