Final Battle with Sigma
At the password menu enter the follwing numbers: 3217-8153-6772-3823. You will now face the final boss(sigma), have all weapons, all upgrades, all robot suits, heart containers, a super chip for your arm, full energy containers and zero's saber.
Final Battle with Sigma
To battle sigma, start the game and go to the password section. Then enter 3217-8153-6772-3823. You will see zero's face if entered correctly. Now you can battle sigma with all upgrades and the Z-Saber.