About Candy Grab
Candy Grab is a family of take-away games, the oldest of which is called Nim. You and Gobble the robot take turns grabbing candies from jars. Each game has its own rule: in some you may take 1 or 2 candies, in others any number from one jar, and in some the last candy is a sour lemon that loses.
Every game can always be won by the player who goes first, if they know the trick, and Gobble never misses a chance to win. So the real puzzle is finding the pattern: why is leaving 3, 6 or 9 candies so good? Lose a round and Gobble gives a clue; win all three rounds to earn three stars.
The tricks are real maths: times tables and remainders in the first games, copying moves in the two-jar games, and the famous binary pairing trick for three and four jars. You can also play against a friend on one phone. A robot checked that every clue is true for every possible position.
Best for ages 7+
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