Dance Dance Revolution Scoring systems 1st through EX are explained here: Aaron in Japan. (Note: I'm responsible for the MAX2US/JP and EXCS Endless scoring systems)
Original post (dated 01OCT03) regarding IIDX scoring can be found here: Link to Aaron In Japan forums.
Beatmania Complete Mix 2 (5-key) is based out of 100,000 points.
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For each note,
Perfect Bonus (Score=100000): +3110 points
Let N = total note count
Base value: 100000 / N
Any Great -> Score = Score + N
.....Good -> Score = Score + N / 5
Bad & Poor-> Score = Score + 0
Border Bonus (Pass with only one red bar showing): +???? points
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All IIDX versions are based out of 200,000 points and are somewhat combo-based. Breaking your combo costs you more than just one note's worth of points!
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If your combo is 1 to 10:
If your combo is 11 OR MORE:
Border Bonus (Pass with 80%): +5730 points
Let N = note count
Let B = 100000 / N
Let C = current combo including note
Let V = 50000 / (10 * N - 55)
The score for a given note is as follows:
......GOOD -> Score = Score + 0.2 * B + (C - 1) * V
.....GREAT -> Score = Score + 1.0 * B + (C - 1) * V
JUST GREAT -> Score = Score + 1.5 * B + (C - 1) * V
......GOOD: Score = Score + 0.2 * B + 10 * V
.....GREAT: Score = Score + 1.0 * B + 10 * V
JUST GREAT: Score = Score + 1.5 * B + 10 * V
Perfect Bonus (Score=200000): +???? points
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