Learn the clock with this colorful puzzle. The pieces are square with curved edges, which makes them different from each other even though they look the same. We call such pieces quiz pieces, each piece only fits in the right place. On each piece there is a clock, and the clocks show different times. On the frame under the piece, a time is indicated with both numbers and letters. The figures show the time with both 12- and 24-hour times. The 42 times are chosen to give great variation, and show the clock at full hours, half hours, 25 minutes, 20 minutes, 15 minutes, 10 minutes and 5 minutes. Those who are going to learn the clock can work at their own pace, try and fail. When the pieces fall into place, you know that the answer is correct, then you learn quickly.