Salamander (沙羅曼蛇 / サラマンダ, Saramanda), retitled Life Force (ライフフォース, Raifu Fōsu) in North America and in the Japanese arcade re-release, is a scrolling shooter arcade game by Konami. Released in 1986 as a spin-off to Gradius, Salamander introduced a simplified power-up system, two-player cooperative gameplay and both horizontally and vertically scrolling stages.