roblox allows players to create games and play games created by others, with many different types of games available. roblox can be used on most devices such as ios, and xbox, but it can't be played on a browser (example: google). "roblox" itself is free to play, however, virtual accessories can be purchased in the store using "robux", a currency which costs real money to obtain but can also be earned by selling virtual items to other players.