PROBOTECTOR

Level codes:
Level 2 - 1227
Level 3 - 0501
Level 4 - 0948
Level 5 - 2168
Level 6 - 0666
Level 7 - 1192

30 lives:
At the title screen, type in the following before the music stops.
Up, Up, Down, Down, Left, Right, Left, Right, B, A and Start.