"Hidden & Dangerous" was a commercial success, with 350,000 units sold globally by May 2000. Sales had surpassed one million copies by 2007. It was particularly popular in the United Kingdom. According to "PC Gamer US", most of the game's success derived from European markets. A writer for the magazine reported, "The game wasn't so fortunate in the States, where it received warm reviews but endured poor sales — partly because of intense competition from "Rainbow Six", a lack of multiplayer options, and relatively little marketing exposure."