Blaster Master is an action-adventure video game released by Sunsoft for the Nintendo Entertainment System (NES) in 1988. The game combines the open-ended exploration of Metroid with the platform shooting action of Mega Man. Players control Jason, a young man who descends into a subterranean world to rescue his pet frog Fred from the monstrous mutants beneath the Earth. The game features unique gameplay mechanics, alternating between side-scrolling platform shooter sequences in a tank (nicknamed SOPHIA), and overhead-perspective sections when Jason is on foot. Blaster Master is renowned for its non-linear gameplay, detailed graphics, and challenging difficulty level.