The history of FPS games is also a history of collaborations and influences. Without Wolfenstein, you have no Doom. No Doom, no Half-Life. No Half-Life, no Counter-Strike, and so on. Whether it's FEAR or Far Cry, Deus Ex or Delta Force, the big-hit shooters all owe a debt of inspiration to one another. In that spirit, two of the best-reviewed FPS games on all of Steam have finally forged an official crossover. Available via a free update, this is, quite literally, Mullet Mad Jack meets Ultrakill.
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