Last Level
Go to PASSWORD and type in VGSGF to be on the last level against the T-X.
Level select
Enter HKSGP as a password, then pause game play and select "Quit".
Level Easy Hard
2 NRBGB DTBGB
3 RWHGK
4 NGGGC
5 BMFGT
6 LRHGF
7 NRPGD
8 RLPGJ
9 LWRGH
End JGSGF