The precursor to Wolfenstein 3D. It's immediately clear what the limitations of this engine are in hindsight, particularly in terms of the "camera." It seems to swing outwards from the player as if on a stick, rather than playing through the protagonist's eyes. It's very easy to feel motion sick playing, even for the most experienced, and I had to step away for a minute after so much slow, confusing spinning.

With all that said, I have to appreciate this game a fair bit for what it was able to do with the technology on hand, and while the levels can be very difficult to keep track of because of the limited textures and even more limited movement options, the design is fairly intuitive and shows an early example of the "red key for red door, blue key for blue door" trope the genre would run with later on.

The game is quite easy with frequent health pickups, unlimited ammo, and stun animations on any enemy meaning that the only skill limitation is how fast you can spam Ctrl. There is a genuine sense of tension that comes from the slow swing of the camera, though where you'll never know if, in the time it took you to swing the camera 360 degrees, an enemy has appeared from around the corner. Turning corners is always a risk because of the difficulty of strafing, and ultimately despite being quite easy encounter-wise I was genuinely impressed with the gameplay.

Also, I was actually able to reasonably complete this game which, for a game of this era, gains it an additional point for not being unfinishable bullshit.