Renamed Genesis in the United States for trademark reasons, the SEGA console was launched there in 1989 with an aggressive marketing campaign and the provocative slogan "Genesis does what Nintendon't". A notable feature: American games used cardboard cases, more fragile than their European and Japanese counterparts, making well-preserved copies particularly sought after today. The American market also had its exclusive gems like TMNT: The Hyperstone Heist, a unique version of the Ninja Turtles game different from the Japanese and European one, or Contra: Hard Corps, which remained uncensored unlike its European version Probotector. The US sports scene also influenced the releases with games like Bill Walsh College Football or Coach K College Basketball.