Order numbers from 1 to 20.
Choose a level by clicking one of the trunks.
Order numbers 1 to 5.
Order numbers 5 to 9.
Order 5 consecutive numbers from 10 to 20.
Move the mushrooms into the correct order, then click the big mushroom to check your answer.
If you get it correct the mushrooms will pop down and leaves will fall.
When you've got it right click the next button to try some more numbers.
Have fun! NB: Problems with sound - currently some of these games lose their sound if you open another tab. I don't quite know what's causing this, but am investigating. If you lose sound and want it to return you may need to refresh this page.