Hidden Sound Test
When the main title "GP Part II" comes out, but before any music heard, Hold L+R button on Controller 2, and press "Start" button on Controller 1. The screen will changed to dark with only "Sound Test" text appear. To choose the music, tap the D-pad left or right to make the music titles appear. To plays the music, just tap B or A button.
A the title screen, select GP Race, then enter the following passwords at the Continue screen:
Password Effect JHDXB1CX PZBZ5WLCL YFW4BB4B DBGDBBCF2 Round 02 JMGYB1CX PZBZ5WWC4 #LCRKCWB GBGFBBDK6 Round 03 JSOYB1CX PZBZ5W4FM RRYBLDLB JBGHBBCPH Round 04 J126B1CX PZBZ5XKHP G128TGBB KBGRBBCZW Round 05 J527B1CX PZB25XSJY O6G4XGBB MBGSBWGDB Round 06 J93FB1CX PZB25XZKZ D#14OGWB MWGYBWCK6 Round 07 KC3FB1CX PZBZ5X7K7 XFJW3HBB QWG3BWKQJ Round 08 KJKFB1CX PZBZ5YFMQ &K3G6JBB RBG5BWJVD Round 09 KPKGB1CX PZBZ5YQP0 SRK88J40 TBG5BWHY& Round 10 KTKGB1CX PZBZ5YYP0 5W48#6BD WBL8BWZFZ Round 11 KPKGB1CX PZBZ5Y6RH K1MXBLLD YBL8CMBJF Round 12 K2KGB1CX PZBZ52BSS 356SBMLD ZBR&CMJPF Round 13 F2L8FCMW YWDWBFF9S R8687PWJ XBG9B5HWC Round 14 - Europe
To get speed boost at the beginning of race, just try to make the speedometer's needle-hand pointing at the line between number "8" and "10" when the green light's up. If you time it correctly, you will get extra boost which may passed all the opponents when the racing just starts. This trick is working almost the same like Speed Boost trick in Mario Kart.
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