Robodemons (NES)

CheatingDome.com

Infinite Continues

At the Game Over screen, hold A and Down to avoid using continues, allowing you to keep your current count.

Invulnerability and Level Skip

During gameplay, hold Up + A on Controller 1 and Up on Controller 2, then press B on Controller 1. Hold A and press Select to enable invulnerability, or hold B and press Select to skip to the next level.