Best system for multiple layout and save ?

Hello,

I need to make a lot of level in my game (for more random, but nor precodurally generated), and i dont know if is good to make 50 layout and randomly choose one on start, or make the level on a array !

and second queestion, i made a save system in node webkit, this is save my variable (life / xp) on a txt file. But its possible to encode this file (like an anti-cheat you know) ?

thank you

you can make as many layouts as you want, that will not effect your game if they are not loaded.

for file crypting i dont know, you could add some simple math before saving and loading to change the numbers in your txt file