Here's the guide for the ultimate score. Save alot of iceballs. Use them all at once. The higher you are when you shoot iceballs, the more efficient they are. So if you save up 50 iceballs (like I did) and use them all at once, the core will be frozen for minutes! Rate this up if you find this comment helpful! :)
 "Nano Kingdoms"){kind=icon}
 "Tasty Planet"){kind=icon}
 "GemCraft Labyrinth"){kind=icon}
 "The Magnificent Minionizer Masquerade"){kind=icon}
 "Burrito Bison"){kind=icon}
 "endeavor"){kind=icon}
 "Flaming Zombooka 2"){kind=icon}
 "Truck Toss"){kind=icon}
 "Feed the King"){kind=icon}
 "Monkey Poo Fight"){kind=icon}
 "SHIFT 3"){kind=icon}
 "Open Doors"){kind=icon}
 "Rock 'n' Risk"){kind=icon}
 "Doodle God"){kind=icon}
 "run.don't.stop"){kind=icon}
 "Duck, think outside the flock"){kind=icon}
 "Async Racing"){kind=icon}
 "Epsilon"){kind=icon}
 "Balance Balls 2"){kind=icon}
 "Phage Wars 2"){kind=icon}