Konami's 1981 arcade game "Frogger" introduced a dynamic approach to video game music, using at least eleven different gameplay tracks, in addition to level-starting and game over themes, which change according to the player's actions. This was further improved upon by Namco's 1982 arcade game "Dig Dug", where the music stopped when the player stopped moving. "Dig Dug" was composed by Yuriko Keino, who also composed the music for other Namco games such as "Xevious" (1982) and "Phozon" (1983). Sega's 1982 arcade game "Super Locomotive" featured a chiptune rendition of Yellow Magic Orchestra's "Rydeen" (1979); several later computer games also covered the song, such as "Trooper Truck" (1983) by Rabbit Software as well as "Daley Thompson's Decathlon" (1984) and "Stryker's Run" (1986) composed by Martin Galway.