Development
The arcade version of the game was released under its original title in Japan (version J) and Europe (version D) and as Life Force in North America. The Japanese and European versions are nearly identical, but the American version changes the game's plot by adding an opening text that establishes the game to be set inside a giant alien life-form which is infected by a strain of bacteria. Stages that featured starfield backgrounds had them changed with the web background from Stage 1 to maintain consistency with the organic setting of the plot. The power-ups are also given different names, with the "Speed-Up" becoming "Hyper Speed", the "Missile" becoming the "Destruct Missile", the "Ripple Laser" becoming the "Pulse Laser" and "Force Field" becoming the "Shield". Voiceovers are added to the beginning of each stage, detailing the area of the alien's body which the player is currently inhabiting (i.e. "Enter stomach muscle zone", "Bio-mechanical brain attack", and so on).
Konami later released an enhanced version of Salamander in Japan bearing the American title of Life Force which further fleshes out the organic motif. All of the backgrounds and mechanical enemies are completely redrawn and given organic appearances. The power-up system was also modified, with the Japanese Life Force using the same power-up gauge as the original Gradius. Some music tracks have been completely changed for this release. The power-up gauge is arranged differently for both players as well.
Read more about this topic: Salamander (video game)
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