Really? Which ones (except for AD&D where it is done for the purpose of compatibility with the orignal Pen&Paper RPG system, not for gameplay or mechanics)?
[quote name='Orymus' timestamp='1317299109' post='4867165']but recent games have proven successful with 'handcrafted' level tables (quite ironically).
Is there any benefit for handcrafing these? I mean, you will handcraft either liner or a curve shape anyway, so why not use a formula for this and forget all the hassle? Handcrafted table would make sense if there were some oddities (like suddenly after level X the requirements become linear instead of progressive or the shape of the curve changes), but I don't recall any game that had such oddity nor I can think of any benefit of implementing such oddity.
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I don't know about most of the stuff you said (as it's a question to someone else), but you do bring up a good point. No matter how you do a hand crafted xp system your going to get something that looks nearly liner or parabolic. I made mine by hand and when I grafted it I got basically a exponential curve of sorts. (It's on the paper). A formula really would have been easier.