The double pack contains Gods and Speedball 2 - originally released by Krysalis - and are a tenner each if bought separately. Or go for a Bitmap blowout and get these two plus Chaos Engine for twenty-five quid.
Okay, fairly blatant plugging there but Speedball 2 is one of my all-time faves, and Gods isn't too shoody by all accounts. Time to get yourself some harddrive installable classics if you haven't already got them...