Zero Tolerance is a 1994 video game developed by Technopop and published by Accolade exclusively for the Mega Drive/Genesis. It was one of the very few first-person shooters for the console, along with Bloodshot and Duke Nukem 3D. Plot The game takes place in a future where mankind has made great advances in interstellar travel and subsequently colonized the Solar System. There are extrasolar settlements, research outposts, mines, commercial colonies, and spacecraft and space stations throughout the Solar System are protected by an interstellar military conglomerate named the Planet Defense Corps. When Europa-1, the flagship of the Planet Defense Corps, is attacked by an unknown yet lethal aggressor of extraterrestrial nature, the Planet Defense Corps call in Zero Tolerance, an elite strike squad containing five specialty-trained commandos. A recording of Europa-1's last transmission shows that there was a lot of fire damage to the warship, that almost everyone on board died, and that strange creatures were looking for the few people who managed to escape the attack. Additionally, the nuclear cooling system of Europa-1 has been damaged by a small arms fire, and a core breach caused by overheating will destroy the star ship in a matter of hours. During the crisis briefing, the player character is told to sneak into Europa-1 before it blows up as a member of the Zero Tolerance squad. Their mission is to eliminate the mysterious alien aggressor from within and the transformed humans of Europa-1 that have been "infected" in the next few hours to erase all evidence of the attack and the alien intruders. Gameplay Zero Tolerance has 40 levels spread out over three different areas: the space warship Europa-1, an abandoned merchant freighter, the Planet Defense Corps' heavily fortified central command building, and the sub-basement areas of that building. The objective of the game is to kill all of the enemies on a level and then proceed to the exit, which is either a staircase or elevator leading down to the next level. However, nothing prevents the player from heading straight toward the exit without killing all of the enemies. If this is done, the player is simply not given any passwords until the entire area is finished. When a character is killed, he or she is marked as "deceased" and is no longer playable. The player can choose from a total of five different characters; once they are all deceased, the