Blaster Master: 1988
Developer: Tokai Engineering
Genre: Shooter
Blaster Master Game Manual

You’ve fallen down a hidden manhole into a world of creatures so terrifying they’d scare the rats away. You can panic and perish, or blast your way through an endless maze of tunnels, searching for the secret passages to your escape. And that’s the easy part. Because the Masters of the Caverns lay waiting – prehistoric creatures so powerful, so gigantic, they literally fill your screen! So load your arsenal and get ready for BlasterMaster.