Chasm - The Riftv2.10 Description:
Time channels are forming in the earth's atmosphere, and through them, the most aggressive creatures are starting to penetrate from the past and present and to the future. These creatures are undergoing irreversible mutations that are making them wild and aggressive. You play the soldier of the special commando unit with the mission to locate, pin-point and finally destroy the time channels and eliminate all alien life forms. You can blast off parts of the monsters, without actually killing them, allowing them to continue to act depending on degree of damage.
The game features a variety of intriguing and interconnected missions, and head-to-head, multi-player, and network support.