Unlike other cheating methods, cheat codes are implemented by the game developers themselves, often as a tool to playtest certain aspects of the game without difficulty. One of the earliest known examples of this type of cheat is the Konami Code, created in 1986 by Konami developer Kazuhisa Hashimoto as he worked on porting the 1985 arcade game "Gradius" for use on the Nintendo Entertainment System. Hashimoto is quoted as saying "The arcade version of "Gradius" is really difficult, right? I never played it that much, and there was no way I could finish the game, so I inserted the so-called Konami code."