Normally, I hate any idea that has anything to do with putting a goal into Minecraft, but I think this idea is really good. I think:
-It should not be normal in single-player, but players have the option of downloading a mod from the site that lets them have this in the game.
-It could be a new game mode for SMP in which players race to find the artifacts. It can also have the option of turning dead players into "ghosts", and the player who finds the most artifacts before dying wins. (if players are tied, then whoever collected that number first wins; if all players are dead except for one, then the last player has to beat the person in first place within a specified amount of time to win)
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-It should not be normal in single-player, but players have the option of downloading a mod from the site that lets them have this in the game.
-It could be a new game mode for SMP in which players race to find the artifacts. It can also have the option of turning dead players into "ghosts", and the player who finds the most artifacts before dying wins. (if players are tied, then whoever collected that number first wins; if all players are dead except for one, then the last player has to beat the person in first place within a specified amount of time to win)