See How to Use the Features of Balancing Chemical Equations
Have you seen the video primer for Balancing Chemical Equations? See how to use the Intro and Game panels as well as how you can use the simulation to challenge your students.
The PhET Blog
I wish we had such learning tools back in 1990’s. Chemistry was not my favorite subject and balancing equations was a small hell for me. Never figured how to equalize elements valence. Great app. Keep up the good work!