Tunnel B1 is an action-packed shooter game for the Sega Saturn where players navigate a high-speed hovercraft through subterranean tunnels. Released in the 1990s, it blends elements of racing and shooting genres. The game features a first-person perspective, where players must evade obstacles and enemies while traversing through the claustrophobic environments at breakneck speeds. With a variety of weapons at their disposal, players take on multiple levels, engaging in combat against enemy vehicles and bosses. Its unique blend of genres and immersive underground setting provide a distinct arcade-like experience.