Söldner-X: Himmelsstürmer is a 2007 scrolling shooter video game developed by German company SideQuest Studios and published by Eastasiasoft.

Söldner-X is a traditional 2D shoot 'em up game with parallax scrolling, 720p high-definition graphics, weather effects and a rich weapon upgrade system.

A sequel titled Söldner-X 2: Final Prototype was released for the PlayStation 3 as a download-exclusive game in May 2010.

The sequel removes the weapon charging mechanic and limited ammo from the original game, resulting in a more traditional gameplay experience.

[4] An enhanced version of the game for the PlayStation 4, titled Söldner-X 2: Final Prototype Definitive Edition was released in November 2020.