Once a technical marvel, Zero Tolerance Collection is now severely dated. Fans who live to relive days gone by might get a kick from diving back into the Planet Defense Corps facility, and the new Underground set of levels is a nice, if limited, bonus extra. But tweaks to provide an updated graphics option, improved frame rates, audio tracks, and true button remapping would have been greatly encouraging for existing fans and newcomers alike. As it is, this collection is largely just a ROM set thrown into a lacklustre zip file, with a frustrating level of non-effort.