 Many of these were credited to Mega Soft, a California-based company which was listed in "Nintendo of America, Inc. v. NTDEC" as their North American distribution arm.Six games previously released by them in 1991 were compiled on the "Caltron 6 in 1" multicart in 1992, which was distributed in the United States - since this cartridge contains only NTDEC/Mega Soft games and carries the same CN-xx ID as the previous original NTDEC games; Caltron (or Caltron Ind.Inc.)