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Life Force (Salamander) is a classic shoot-'em-up game launched by Japanese developer Konami in 1986. First released for arcades, it was later ported to the NES and many other platforms. A follow-up to the Gradius series, it retains the core gameplay of its predecessor while adding a two-player co-op mode, letting two players pilot separate fighters on an adventure together. The game features six levels: odd-numbered stages use horizontal scrolling, while even-numbered ones use vertical scrolling. With diverse level designs, players will travel through varied environments like space stations and underground caves. Players can collect power orbs to upgrade their weapon systems, gaining stronger firepower to fight enemies. The game has a high difficulty level, requiring players to practice repeatedly and memorize enemies and traps in each stage to win.