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Cruel and crafty invaders have been spotted in battle formation ready to attack your ship just below them. You must shift quickly and skillfully from left to right as you return their fire, but be careful because they are accurate. 3 skill levels. 1K.
Source Code
100 PRINT "LEVEL?" 110 INPUT B 120 IF B<1 OR B>3 THEN GOTO 110 130 CLS 140 POKE 17178,30*B-26 1000 PRINT USR 17267