A friend of mine gave me a link of some good puzzles. Most of them were common sense based challenging your power of estimation, visualization and creativity. But I found this interesting one.
Puzzle: Count from 1-10 in base negative 2
Puzzle2: You have three baskets filled with fruit. One has apples, one has oranges, one has a mixture of both. You cannot see inside the baskets. Each basket is clearly labeled, and each is labeled incorrectly. How can you determine what’s in each basket by choosing only one fruit from one basket?