Dance Dance Revolution 2nd Mix (c) 1999 Konami.

>>> TECHNICAL DETAILS
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Main CPU : PSX
Sound Chips : SPU, CD/DA
Palette colors : 65536
Players : 2
Buttons : 6
- SCORING -
Grades : SS - S - A - B - C - D - E
The formula for calculating the score for a combo is a bit complicated, the point value for any step in a combo depends on two factors :
* Perfects are worth 3 times as much as Greats.
* The point value for a step increases every time the combo increases by 4.
The exact formula for the score of a combo is...
let [x] denote the greatest integer function (i.e., where [x] is the greatest integer less than or equal to x). Then, the point value for the nth step in a combo is :
S(n) = G(n) if the nth step is a Great, or P(n) if the nth step is a Perfect;
G(n) = 100 ([n/4]^2 + 1);
P(n) = 3G(n);

>>> TRICKS AND TIPS
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* Hidden Mode : To activate Hidden mode, push the joystick UP, DOWN, UP, DOWN, UP, DOWN prior to selecting a skill level (Hidden mode will make half of the arrows disappear).
* Another Mode : At the song select screen, press : DOWN, DOWN, DOWN, LEFT, LEFT, RIGHT, RIGHT
* Little difficulty : Press LEFT, DOWN, RIGHT, DOWN, LEFT, DOWN, RIGHT, DOWN, UP at the song selection screen (The word 'Little' confirms correct entry). In Little mode, dancing is easier.
* Maniac difficulty : Press DOWN, DOWN, DOWN, RIGHT, UP, UP, LEFT or DOWN, DOWN, LEFT, LEFT, LEFT, RIGHT, RIGHT, RIGHT, LEFT, RIGHT prior to selecting a skill level (The word 'Maniac' confirms correct entry). Note : To disable Maniac mode, press UP(x8) at the song selection screen.
* Play as Socket Man : Hold left Select and press Start.
* Shuffle mode : Press UP, DOWN, LEFT, RIGHT, DOWN, UP, RIGHT, LEFT at the song selection screen (The word 'Shuffle' confirms correct entry). In Shuffle mode, there are new dance steps.
* Unlock 2P Modes : To unlock 2-Player modes, push 1P Start button. Then hold 2P's right and left Select buttons while pushing 2P Start (This code unlocks Couple, VS, and Double modes).
* Dancers face right : Press Right (x8) at the song selection screen (The word 'Right' confirms correct entry). In Right mode, dancers face right.
* Dancers face left : Press Left (x8) at the song selection screen (The word 'Left' confirms correct entry). In Left mode, dancers face left.
* All songs : Highlight Hard mode and press Right Select button (x4).

>>> GAME SERIES
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1. Dance Dance Revolution (1998)
2. Dance Dance Revolution 2nd Mix (1999)
3. Dance Dance Revolution 2nd Mix with beatmaniaIIDX CLUB VERSiON (1999)
4. Dance Dance Revolution 2nd Mix with beatmaniaIIDX substream CLUB VERSiON 2 (1999)
5. DDR Best of Cool Dancers (1999)
6. Dance Dance Revolution 3rd Mix (1999)
7. Dance Dance Revolution USA (2000)
8. Dance Dance Revolution 3rd Mix Plus (2000)
9. Dance Dance Revolution 4th Mix (2000)
10. Dance Dance Revolution 4th Mix Plus (2000)
11. Dance Dance Revolution 5th Mix (2001)
12. DDR MAX - Dance Dance Revolution 6th Mix (2001)
13. DDR MAX 2 - Dance Dance Revolution 7th Mix (2002)
14. Dance Dance Revolution Extreme (2002)
15. Dance Dance Revolution Extreme 2 (2005, Sony PlayStation 2)
16. Dance Dance Revolution with Mario (2005, Nintendo GameCube)
17. Dance Dance Revolution SuperNOVA (2006)
18. Dance Dance Revolution SuperNOVA 2 (2007)
19. Dance Dance Revolution X (2009)

>>> GAME PORTS TO OTHER SYSTEMS
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* Consoles :
Sony PlayStation (1999)
Sega Dreamcast (2000)

>>> OTHER GAME RESOURCES
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Game's rom.