From my review on

It's hard to believe... and rather amusing... but there was a first-person shooter released for gameboy even before Wolfenstein 3D came out. Naturally it hasn't withstood the test of time very well- with its dazzling 8 fps animation, choice of one weapon to choose from, and lack of a strafe button, gameplay is reminiscent of dueling with heavily-loaded shopping carts armed with nerf guns, underwater. Except that your bullets don't fly straight up. All the same, I bought it as soon as it came out, and loved it. I would have given my left kidney for a friend geeky enough to own it as well, so I could kick his ass in Arena mode.
C'est la vie.