Yes you got everything right. You need to collect crayon to be able to draw on paper. Then do all the 3 task. If you do it correct then a gate will open. If you did all the tasks but nothing happened then might be possible you playing the tune wrong on piano or doing the task at the wrong time. So just let me tell you the correct tune, if you mark all the white keys from left to right like 1-9 then correct tune is 3276. Now try again and let me know.