At the menu that appears after you insert the CD-ROM, select the "Bonus Material" option. Once 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" will appear. 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.