Side shooter (defender type) game from 1981?

Got a friend who is trying to find the name of a game she used to play when she was very young. All she can remember is that it was a side scrolling space shooting.
Ive shown her Defender and she thinks it was similar but not it.

Can anyone suggest some Defender type games from 1981? So that would be a side scrolling space shooter. It had a similar terrain layout (with the hills etc).

Any help would be appreciated. Thanks

Vanguard?

Scramble?

Well, there was a sequel to Defender called Stargate. It was essentially the same game with some extra bells and whistles.

Zero Wing?

If so, then I guess all your base belong to her.

Enjoy,
Steven

Stargate was basically an expanded defender with more complexity.

Awesome game.

Super Cobra? (before '81, IIRC)
Space Fury? (color vector)

Zaxxon wasn’t exactly a sideshooter but it was one of the most common of arcade games of the era. Loved that game.

My money’s on Cosmic Avenger.

If I had all the quarters back I spent on this game, I could buy one. I wonder if the old lady will let me keep it in the living room?

I used to have a big callus on my thumb from the buttons. “Defender Thumb”, I called it, although I think Stargate was about 90% responsible.