I had a 17 inch CRT monitor up until August of 2008 when I bought a 22 inch 1080p widescreen monitor. You can argue that CRT monitors are HD too since their native resolutions are 1024x768 or something but we know how tiny games look on them compared to widescreens. The first game I tried was some Star Trek first person shooter, an although I didn't like it and only played for like 15 min, the full HD effect of that game got burned in in my memory. Then I played Hitman Blood Money and Witcher and the full HD effect soon wore down. Now games on CRT look constrained rather than widescreen looks huge.
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Deus Ex (2000) - a game that pushes the boundaries of what the video game medium is capable of to a degree unmatched to this very day.