Coloring by Numbers
Use the coloring control to shade the table according to the values of the physical or chemical properties of the elements.  Click on the color spectrum to switch between monochrome and color shading. 
Data Display and Element Information
Click on the "Data" tab to access the Data Display controls. Use these to display "Atomic Spectroscopy Detection Limits," "Macroscopic Properties," "Atomic Properties," or "Chemical Properties."
Click on an element in the table to get information for that element.

[Detection limit data are from R. J. Gill, Am. Lab. November 1993, p. 24F using instruments from GBC Scientific Instruments.]
Jigsaw Puzzle
Press the "New Puzzle" button to scramble the elements. Then test your knowledge by dragging each element to its proper location in the table.  When you can't figure an element out, press the "Solve" button.
Molar Mass Calculator
Click on the "Masses" tab to calculate molar masses. To enter an element in a compound, click on that element in the table. Use the digit and parentheses buttons to complete a formula.