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There's already a game that's powerful enough to make you spend your whole day with it in delight. Redactle Unlimited gives you a fun challenge that challenges you to find the content of an article with almost all the words hidden.
What you need to do is to guess the words covered in the content of the article. Type the guessed word and press Enter to see if it is in the article and how many times it appears. When the correct number of words found is enough, you can use it to guess the topic. The game allows you to play unlimitedly.