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Braingle hosts more than 20,000 brain teasers, trivia quizzes, games, and mentalrobics (aerobics for the brain). The games section is comprised of popular games like chess, checkers, sudoku, and common word games. The Mentalrobics section of Braingle is what makes it worth mentioning. Mentalrobics includes memory tests, flashcards, and vocabulary building activities. The vocabulary builder activities require users to register for a free Braingle account. To help users practice more effectively the Braingle vocabulary builder tracks the words users know and the ones they don't.

Smart Kit (no affiliation with SMART) offers a large collection of games, puzzles, and riddles for students of all ages. The content of the collection ranges from simple drilling-style games to challenging word puzzles. There are sixteen categories of games offered by Smart Kit. The categories of most interest to educators are probably the math puzzles and word puzzles categories.