Some NES games were developed by companies who had licensed their title from a different arcade manufacturer. While the creator of the NES version would be restricted from making a competitive version of an NES game, the original arcade copyright holder was not precluded from licensing out rights for a home version of an arcade game to multiple systems. Through this loophole, Atari 7800 conversions of "Mario Bros.", "Double Dragon", "Commando", "Rampage", "Xenophobe", "Ikari Warriors", and "Kung-Fu Master" were licensed and developed.