the title uses either a checkpoint system in which a downed single player will start off at the beginning of the checkpoint they managed to reach before dying, or a respawn system where their ship immediately starts at the location they died at. Getting hit by enemy fire or colliding against enemies will result in losing a life, as well as a penalty of decreasing the helicopter's firepower to his original state and once all lives are lost, the game is over unless the players insert more credits into the arcade machine to continue playing. After completing the last stage as with previous titles from Toaplan, the game begins again with the second loop increasing in difficulty and enemies fire denser bullet patterns. Development Twin Cobras creation process and history was recounted through various Japanese publications by composers Masahiro Yuge and Tatsuya Uemura, both of which collaborated with the soundtrack using guitar and marked the second time Toaplan made use of FM synthesis. Yuge stated that the basic structure for the game was already decided during development of Slap Fight by pursuing the excitement of shooting and dodging, settling on the bomb and shot system, claiming that firing a bomb relieved stress from players, as they wanted to make a game that was fun by looking at and get passionate about it. Yuge also claimed that the word "Kyūkyoku" for its Japanese title derived from a translation of Going for the One, the eight studio album by English progressive rock band Yes, as it was not a popular word at the time and although the Japanese title was initially rejected by then-president of Toaplan, he was determined to implement it. The concept of using a bomb came up during development of Tiger-Heli, where the team questioned how to make a shoot 'em up game more engaging for players but it was never intended for defensive purposes according to them, as the mechanic was instead implemented to provide an aggressive feeling against enemies on difficult situations, however enemies were made tougher to keep gameplay balance. Twin Cobra was also, alongside Slap Fight, one of the earliest projects Toaplan made use of game design documents, with both Uemura and Yuge stating that ideas by the team were first written in text using A4 paper before reading it during meetings. Several features were integrated into the project by diverse factors such as items