Choose the game that interests you and play itfor free.
Complete the quests
Every game has some quests for which you will receive Soul Gems.
You can exchange your Soul Gems for Steam Wallet top-ups, game keys, CS:GO Skins and other rewards.
I need some robux so i need lvl 3, I like Roblox for being a kids game, the game is pretty nice even if they deleted tix