For those looking to battle the god of time: Star a song on pro mode 9 times in a row. The next song you choose should have a message that says: "Time SK-sk-ips. F-f-fight it?" To face the god of time with this message, select the choice that says, "O-k-kay." This can be done only on pro mode, since you need a x10 multiplier to even do damage to him.
oliwiatutak66: to get the dark guitar maniac, first unlock the song, "i just wanna burn". once you unlock that song, purple squiggles will appear on random songs. perform well enough on three of these songs in a row, always following the purple squiggles. after three songs, the purple squiggle will be at "i just wanna burn. a message for the boss should appear. accept this challenge to face the dark guitar maniac.
 "Particles"){kind=icon}
 "SCGMD4"){kind=icon}
 "New Star Soccer"){kind=icon}
 "Red Remover Player Pack 2"){kind=icon}
 "Papa's Wingeria"){kind=icon}
 "Animemo"){kind=icon}
 "DJManiax"){kind=icon}
 "Achievement Unlocked"){kind=icon}
 "Nightmare Runner"){kind=icon}
 "Super Crazy Baseball Maniac Deluxe"){kind=icon}
 "Async Racing"){kind=icon}
 "Chaos Faction 2"){kind=icon}
 "the idle game"){kind=icon}
 "WereBox 2"){kind=icon}
 "Johnny Upgrade"){kind=icon}
thank you very much