why do I own three doom 3s. why do I own one doom 3. this game came out in 2004 there's no way there's any drm. why do I own three of them

transgender raven woman* | 20s | the one with the lowercase c and the two exclamation marks | posting about whatever I happen to be obsessed with at a given time | i like testament the normal amount
why do I own three doom 3s. why do I own one doom 3. this game came out in 2004 there's no way there's any drm. why do I own three of them
I was confused by it too. why does it come with the original/its expansion and the remaster separately?