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[gcskate27]

its based on your avg multiplier... if you have an avg multiplier of 2.8x or more, you get five stars...

[twistedsymphony]

true... though it's easier to think about if you consider it  2.8 * the base score. where the base score is the number of points you would earn if you Full Comboed without any multipliers. Meaning that each song has a distinct score cutoff point where if you earn more it's 5 stars and less it's 4

it's all explained here:
http://www.scorehero...topic.php?t=378

[Reaper527]

http://www.scorehero...a...me=3&diff=4

here is the version of the 5 star chart i personally find the most useful. its basically a "get X points for  song y to get a Z star rating" type of setup. it seems pretty accurate from what i've been able to gather.