Is it a design question or a technical question? because if you want to ask how to technically do it, i'd go for a variable that counts collected coins (Call it "CollectedCoins" for example) and when that variable reach 10 (compare "CollectedCoins" equal or greater than 10) you can order an action to load another layout. in short, make each level a layout of its own.
If it's a design question, then i am not sure i am following you...