Here are some cheats and tips for the game Serpent.
057-C9D-E6A Start with 5 missiles
087-C9D-E6A Start with 8 missiles
0F7-C9D-E6A Start with 15 missiles
00F-B0E-E69 Infinite missiles on pick-up
157-C6D-4CA Start with smaller tail
407-C6D-4CA Start with longer tail