ragnarok online
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it's a 2.5D mmorpg from 2002, it is quite party-based (and most players are quite friendly, it's always been super easy for me to find parties to level up together in dungeons)
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sadly, the original company who made RO are very incompetent, but private servers have thrived for as long as they could (and some still do)
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the game to me has INCREDIBLE customization, and even if it depends on the private server anyone plays on, there's always such a good selection of cosmetics and dyes
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there's always people hanging out in the main town, called "Prontera"
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and it has quite a nice variety of classes you can choose from, though, people always end up playing multiple of them
the soundtrack's absolutely great
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and the art there is for it is too
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this is where i got my name from,, the kafra corporation, which is a team of maids that offer services to all players
this is the best gameplay footage i can find, because for some reason every ro player loves putting music over their videos (i'll update this link later if i do find better footage in my videos folder, i just have to sort it so i can find it)
also you can move most of the UI in the game, as well as change your angles both horizontally and vertically
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there's so much more to ragnarok online, and i could gladly talk about it so much more... but i'll do that at another time