Flying cars
It is possible to replace the jets with flying classic cars Something can be done in novice mode at level 6 that will result in a constant tone until you get to level 7 Level 7 will then start with classic cars flying at you instead of jets The level passwords with the cars are identical to those with jets You must duplicate some sort of game condition complete all the first six levels with no damage Complete level 6 with no damage and using only one plane to unlock the cars
Level passwords
Level Novice Ace
2 DHGJ KLFF XDFT RLFF
3 GSDF BFPT KJTR DBPT
4 RRHC FDVM RVBP ZJVM
5 BPSX FDNF BMNQ YLNF
6 LDFS DTKQ LFMS DNBQ
7 PXSB SZNJ PGHP CZNJ
8 DKXZ GZQK DKDG BPQK
9 GKQB GHCT GSYP ZLCT
10 DTRH RPFJ DCZX RPQR
11 WZPK JYZX WRTN JYSX
12 JDZF LKFV JDPQ MLRT
13 SPNG DRRG SPBX BMRG
14 SFGF JHDH SPXP RGDH
15 LPFH PRFZ LPFG NBGZ
16 TDKZ XSHX TQWJ GZHN
17 DGBV KMNB BGJK SZPQ
18 KJHG RJCB PLMN HRTY
19 VBMQ RWTP GLMR TRRC
20 LKFD SPBV NHDJ PBCX
21 NHDC DKPM LCML FLTC
Note There are 20 basic levels in the game Level 21 is a repeat of level 1 but with UFOs instead of jets to shoot down The password at level 22 is the same as level 2 You must enter the password for level 20 or 21 and play the game from there to get UFOs instead of MIGs
Stage Codes
Level Novice Ace
2 DHGJ KLFF XDFT RLFF
3 GSDF BFPT KJTR DBPT
4 RRHC FDVM RVBP ZJVM
5 BPSX FDNF BMNQ YLNF
6 LDFS DTKQ LFMS DNBQ
7 PXSB SZNJ PGHP CZNJ
8 DKXZ GZQK DKDG BPQK
9 GKQB GHCT GSYP ZLCT
10 DTRH RPFJ DCZX RPQR
11 WZPK JYZX WRTN JYSX
12 JDZFLKFV JDPQ MLRT
13 SPNG DRRG SPBX BMRG
14 SFGF JHDH SPXP RGDH
15 LPFH PRFZ LPFG NBGZ
16 TDKZ XSHX TQWJ GZHN
17 DGBV KMNB BGJK SZPQ
18 KJHG RJCB PLMN HRTY
19 VBMQ RWTP GLMR TRRC
20 LKFD SPBV NHDJ PBCX
21 NHDC DKPM LCML FLTC
Note There are 20 basic levels in the game Level 21 is a repeat of level 1 but with UFOs instead of jets to shoot down The password at level 22 is the same as level 2 You must enter the password for level 20 or 21 and play the game from there to get UFOs instead of MIGs Entering level 21 in Ace mode gets you started all over again from level 1 but with World War I era triplanes instead of jets or UFOs
