Project Bad Apple's AP400

"Project Bad Apple's AP400" is a fast-paced FPS that takes inspiration from numerous games that had made an impact, such as Half-Life 2 (2004), and DOOM (2016). It is, in its core, a single-player experience. The year is 2018, SIL Corporations, originally a military company, is aiming to put in service hundreds of AP400 combat units, all working for their personal PMC (Private Military Company). And you, unit 51-601, are one of old models, decomissioned and put away, still conscious. And you have something that neither the newer SE series, nor the old barely working prototypes have.