Hunt for Red October Cheat Codes for Gameboy

25 LIVES
On the Map screen, hold A and B, then press Select, Up and Down.

25 MISSILES
On the Map screen, hold A and B, then press Up and Down.

STAGE SELECT
On the Title screen, press B, Select, Left, Right, then Start.
The message "Starting World: 1" will appear. Change the number
by pressing Left/Right, then press Start to begin.