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<p>Before Fortnite and Call of Duty ruled the scene, the US Army quietly shaped the early 2000s with a wildly popular, free shooter designed to excite young people about enlisting.</p><p><a href="https://99pi.org/hl" target="_blank">Hidden Levels</a> is a production of 99% Invisible and WBUR's <a href="https://link.mgln.ai/99percentinvisible" target="_blank">Endless Thread</a>.</p>
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