LifeForce

Salamander, retitled Life Force 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 of Gradius, Salamander introduced a simplified power-up system, two-player cooperative gameplay and both horizontally and vertically scrolling stages. Some of these later became normal for future Gradius games.

Salamander was followed with a sequel in 1996 titled Salamander 2.