Typically, it costs Robux to get these Roblox items, which means spending real-life money, but a lot are also gifted for free ...

Blade Ball codes allow you to earn free rewards, from sword skins to coins, in this Roblox game ... you’ll be rewarded with both the items and the words 'Successfully claimed!' ...

Doors codes are for players looking to claim free Knobs and Revives in Roblox Doors ... Fortunately, there aren't many old codes that have expired over the last few updates.