Common Knowledge Quiz is structured so there's a 20-question test to complete each day (though, obviously you can actually do them as often as you like). As is common in these brain training things, the test results contribute to the intelligence rating on your profile. At the end of each daily test, you're therefore told if you're improving, which subjects you need to practice, and shown a line chart of your progress. Needless to say, you'll ideally want this line to be going upwards.
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Kakuro Help This utility can help you solve the Kakuro and Killer Sudoku puzzles
Abcpuzzle A word puzzle Compose the slogan by moving the letters with the arrow keys