• At least 2 different prototype versions exist! The earliest has a 1983 copyright date on the title screen (picture #1) and 6-digit score counters (picture #2), as well as a number of other minor differences with the released version. A version, dated 1-5-84, is similar to the 1983 version, except it has a 1984 copyright date (picture #3). Both lack the title screen animation of the released version (picture #4).
• Original name was Centipede Plus.
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