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Trivia
Onscreen messages credit the following people as authors of this version: Bill Hindorff, Andy Finkel, Jeff Bruette, Eric Cotton, Mike Scott, and Jimmy Snyder. (Displayed in that order onscreen.)

Trivia
It must have been very interesting to have been around the folks at Commodore in their earliest Vic20 years. This is one of the first game clones actually OK'd by the company that owned the rights. (Earlier games had been made, released, then yanked off the market.) Perhaps because it was so unusual for Commodore at the time, ads then would not let you forget that this conversion was perfectly legitimate and approved by the copyright owners.

Trivia
It's interesting to note that these officially sanctioned carts were some of the first to have been copy-protected, even in ROM. If you copy the ROM's image to RAM (from an unmodified cart) the resulting image will not run in RAM. My question is, whose idea was this; Commodore or Bally/Midway? (Does anyone know for sure?) I can see BM wanting to protect their stuff, as the whole reason they were collaborating was Commodore tried to infringe on them. But if it was Commodore's idea, how hypocritical were they? Am I too harsh? Over half their first 12 carts are questionable! They make their system popular on the merits of other's games and then decide to protect later games from their own customers? Who did they think they'd attract with that type of marketing? Yeesh! Then again, maybe BM saw it this way, and demanded protection?

Advert text:
"(The smash-hit arcade game!) Midway's incredible coin-operated game is now on cartridge for the VIC! Includes 4 completely different games, multiple levels of difficulty, some of the best cartoon graphics ever devised for video games. Invaders, gorfies, death ships, saucers, aliens... it's terrific!" (Seen in the Spring 1983 issue of "Commodore Power Play" magazine, page 104.)

An article in the Summer 1983 issue of "Commodore Power/Play" magazine, pages 38-39, lists ways to use programming bugs to get very high scores. The article was written by Jeff Bruette, one of the Commodore programmers that helped to make this very game.