Hi. I'll help you on how to play the "Rad all levels" category , this is very simple.

-You need to download this file here: https://mega.nz/#!DoIHlIKA!o7SG1x5nhOTlmr5RZYoL_NOEYBeQPInYd_UisuVHKJQ

-Now extract it where you want and open the folder , you'll see there is a file called SaveData.dat and a folder shortcut.

-Right click on the SaveData.dat and click "copy".

-Double click on the folder shortcut , then right click and paste the file overwriting the existing one (if you want you can make a backup copy of your saved state).

-Start the game and you'll have 250 stars without any rad level completed.

Good Luck and Happy Testing.