Play games
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.
Receive rewards
You can exchange your Soul Gems for Steam Wallet top-ups, game keys, CS:GO Skins and other rewards.
I'm rather curious about what other people's experience was like in roblox. Since roblox is an ever changing game, i assume there would be alot of different experiences depending when you joined. Can't wait to hear it!