Press the Up arrow to go up and the down arrow to go down. Also if you have a mouse you can use it to scroll up and down instead. When you have collected 50 crystals, press the space. You have to refresh the page if you want to play again after you pressed it though.
So basically, every year the luminous rainbow stars come down and the dragons have to restore their rainbow power before the stars come. So Iris the dragon is in charge of collecting rainbow crystals. So you have to help her collect the crystals. So there is a little back story behind the game. (Sorry if the rainbow stars hurt your eyes a bit they hurt mine lol)
