The most efficient and legal way to get free Robux is via the affiliate program, monthly stipend, and by building your own game.
If you want to trade something that costs Robux or a rideable and/or flyable pet, you may want to trade it for another Robux item to keep it fair, as Robux is bought using real money. Method 3 Playing as an Experienced Player 1 Build onto your inventory. If you don't have such ...