<_title>The magician hat <_description>Count how many items are under the magic hat after some have got away <_prerequisite>Subtraction <_goal>Learn subtraction <_manual>Look at the magician, he tells the number of stars that are under his magic hat. Then, click on the hat to open it. A few stars escape. Click again on the hat to close it. You have to count how many are still under the hat. Click on the bottom right area to answer. <_credit>