Balancing equations!

 Go to the following link:

https://phet.colorado.edu/sims/html/balancing-chemical-equations/latest/balancing-chemical-equations_en.html

Select the introduction option to review how to do it before the game.

When you feel you are ready, go to the game option:

Enter in the game and select the time.

Do all the levels and take a picture of the mark you make. Send it here in comments.

Try to  overtake me!