Tempest 2000 cheat code
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Hold down 1, 4, and  buttons at the game selection
screen and press the A fire button.  The "Excellent!"
sample will play (lower than usual) and now you can
skip levels using the OPTION button, holding down 6
will enable warp (in Tempest 2000 mode).

rotary controller
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while on the option menu, holding down OPTION and PAUSE on controller 1
and then pressing OPTION and PAUSE on controller 2 will add the new 
option.  


neat tricks
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When warping out of a level, if you still have a SuperZapper charge and
there's at least one enemy still on the grid, SuperZap just as you reach
the far edge.  Your SuperZap bolt will follow you off into infinity.

On the third warp bonus round, press Pause and adjust the volume.
The menus will get sucked up by the Melt-O-Vision routine.

Let yourself get captured by the last enemy in a wave (must be a flipper),
it will play the "WOAH!" sample, but warp you to the next level anyway!