I find myself revisiting Severed Steel a lot. It's an incredibly fast-paced and frenetic movement FPS that I've talked about a lot on PCGamesN, and the team at Greylock Studio keeps adding great updates. First, it was improved ragdoll physics, then dual-wielding weapons, and now you can add any music you want into the game while you play. I suddenly have the urge to play Toxic by Britney Spears while bouncing off walls and shooting guys in slow-mo. Oh, it's also 80% off on Steam to celebrate.
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Mirror's Edge meets Titanfall 2 in FPS game's free update, 75% off
This FPS is The Matrix meets Titanfall, and it's a free game right now