• Civilians. If you kill them, you'll be branded a "renegade" and thrown in prison. You could try Ninja Kicks and GOO Gun attacks on them with impunity, though ;)
• Inventory area. This allows you to keep items that you don't immediately need, such as medi-paks and ammo.
• Grenades, which can be thrown nearer or further away. They will realistically bounce off walls, and you are vulnerable to their explosions unless you have the Gas Mask in your inventory
• Remote-controlled time bombs. This is a fun feature that predates DOOM by at least a few months.
• Some very creative weapons. The Sticky GOO Gun, for example, encases the enemy in a sticky substance that can't be removed without the anti-agent. So you can completely disable enemy guards and finish them off with something else.
• On-screen radar, which always shows your position relative to the area you are in. It is extremely helpful when you are lost in a dark area or a maze. You must first find the radar, but it's automatically activated once you put it in your inventory.
• Different effects from damage on different body parts. For example, if your right leg is hit too many times, you will not be able to walk straight – instead, you will always tend to gravitate to the right.

In addition to these novelties that make the action more fun and varied, Terminal Terror also sets itself apart from other FPSs by focusing equally on avoiding combat. Learning to sneak past the enemies is crucial to success. A special display shows how vulnerable you are to enemy detection; the higher the number, the harder you are to detect. There are many things that factor into this. Definitely a cool concept that predates Thief by a few years.

Overall, I find Terminal Terror a surprisingly enjoyable game that has a lot to offer. Too bad its mediocre graphics and low profile (marketing-wise) condemn the game to obscurity – until now, that is. If you play FPS for gameplay and not pretty graphics, you'll find much to like in this underdog. The game even has multiple paths and optional missions depending on the choices you make during the game. Thumbs up!