Zero Tolerance

Zero Tolerance—developed by Technopop, and released in 1994 (in both NA, and PAL territories)—is a doomclone for the Mega Drive, with some interesting flourishes:

• The player's lives are represented by characters, each with differing abilities.
• The game supports a link cable (designed by the developers), allowing two Mega Drives to be linked for multiplayer games.
• There is jumping, and sloped surfaces; both unusual for the Doom-era.
• The enemies are really aggressive.

• www.technopop.net - ROM download, from the defunct developer's legacy website.
• Zero_Tolerance_(video_game)