At the menu that appears after inserting the CD-ROM, select the "Bonus Material" 
option. After the Bonus Material screen appears, click on "Images" then press 
the arrow to scroll left twice. On the far right, there should be a box to the 
right of a picture of the Tiger Electronics version of Tempest. 
When the pointer is held over it, the text "There was an unproduced Atari 2600 
version of Tempest. It never made it beyond a one-level prototype.
" Click on this box to start the prototype Atari 2600 game that the aforementioned 
text describes, which is not listed on the box under "Atari 2600 titles" and is
 not in the main game selection screen.