This edition has 4 Levels to start you off and an Editor, which allows you add and edit the levels.

Learn to write chemical formulas by dragging and dropping or double-clicking the ions.

The Test Mode randomly selects ions from the Level you have chosen.
To Make the Test More Challenging:

• Include or exclude Atom Counting Questions,
• Testing can be done with or without the extra pressure of time,
• You can set how long the timed test will run for,
• Hide or Show the positive and / or negative ions

A Top Scores window shows the best scores to date.