It isn't impossible to earn Robux, but since Roblox is a free-to-play game, it’s designed to encourage players spend their own money on microtransactions, rather than giving away items for free.

Picking an avatar in Roblox is one of the best parts of the game. There's a variety of pre-made characters you can choose from on the Roblox Store, or you can even choose to design your character ...

Use these Roblox promo codes and unlock free cosmetics like skins, hats, outfits, and more to style your avatar like never before ...

'Scary' virtual currencies Roblox also uses virtual currencies, which must be purchased using "real" currency. For instance, A$8.49 or US$5.00 will purchase 400 Robux to spend in games.

Kids who play Roblox games describe ‘scary’ virtual currencies and ‘cash grab’ random rewards.