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Have you ever played a video game that you never thought could exist? You liked video games but after you played this game you reevaluated all other video games on this one game. Maybe everything else you played sucked after you played this and it ruind all other video games for you. The type of game it is, RPG, shooter, platformer, MMO, etc, doesn't matter. Maybe you liked it for its gameplay or story or community. Maybe you stayed up all night playing it. If there are any games that enlightened you post their titles.
For me it was:
The Longest Journey
Metal Gear Solid 1 + 2
Xenosaga 1 + 3
Deus Ex (none of the sequals)
Lunar Silver Star Story Complete