P99 Green: The way I see it.

[Gruktar]

Like others have suggested, the best thing they could to do bring back the "classic" feel is to change up some of the in-game values, for example:

-Change up the loot table so different named drop different items.

-Change respawn times for zones and rare spawns so players have to discover the new values.

-Change spawn locations for rare mobs.

-Set a new time line for items that get nerfed or removed so no one knows if or when they will actually get removed.

-Change the ZEMs so players have to figure out which zones give the best experience rates.

-Change race/class exp penalties.

Blue can be the "base classic experience" and each additional server/color can have different random values so that each iteration is a little different than the last and players don't go into it knowing exactly what to expect.