It's crazy after two decades there still isn't a game like it. The level design in Deus Ex is in its own league. The game does not give you any clear answers when it comes how you should approach a problem, which cannot be said for most stealth games, or later games in this series for that matter. The game encourages the player to experiment with the games mechanics and think outside the box to solve problems, and the world will react to the decisions you make in ways that still surprise me when I revisit and play a different way. This isn't even getting into the story, which I feel is extremely important that people experience. For a story about nanomachines, clones, secret societies, and conspiracy theories, it's extremely grounded in reality. The game uses this spectacle to point out real problems with American society: the military-industrial complex, the degradation of the middle class, the price gouging and scarcity of proper healthcare, and warned its players about the state using counter-terrorism as a means to take away their citizens' civil liberties BEFORE 9/11. Play this if you somehow haven't already! Your life depends on it!