In a special edition of PlayStation Unchained, PSU speaks with Mark Cale of System 3, an independent developer and publisher that was formed way back in 1982 and has made such titles as International Karate, Putty Squad, The Last Ninja, Ferrarri Challenge and many more.Mark talks to us about a range of subjects, including the two PS4 launch games he's involved in, what he thinks of the PS4 and how Putty Squad on the Amiga became one of the most highest rated games never to be released.