Roblox occasionally hosts real-life and virtual events. There are a sizable amount of scams relating to Robux, largely revolving around automated messages promoting scam websites, scam games designed to appear to give out free Robux, and invalid Robux codes. Robux acquired through the sale of user-generated content can be exchanged into real-world currency through the website's Developer Exchange system.

Prior to 2016, Roblox had another currency, Tix (short for 'Tickets'), that was discontinued in April of that year. Robux allows players to buy various items, and are obtained by purchase with real currency, from a recurring stipend given to members with a Premium membership, and from other players by producing and selling virtual content in Roblox. Items with a limited edition status can only be traded between or sold by users with a Roblox Premium membership. Several individuals design items as a full-time job, with the highest-earning creators making over $100,000 a year off item sales. Only Roblox administrators can sell accessories, body parts, gear, and packages under the official Roblox user account virtual hats and accessories can also be published by a select few users with past experience working with Roblox Corporation. Clothes can be bought by anyone, but only players with a Premium membership can sell them. Roblox allows players to buy, sell, and create virtual items which can be used to decorate their virtual character that serves as their avatar on the platform. Although Roblox has received generally positive reviews from critics, it has faced criticism for its moderation and microtransactions and accusations of exploitative practices directed toward children. As of August 2020, Roblox had over 164 million monthly active users, including more than half of all American children under 16. Roblox is free to play, with in-game purchases available through a virtual currency called Robux.

Roblox began to grow rapidly in the second half of the 2010s, and this growth has been accelerated by the COVID-19 pandemic. For most of Roblox 's history, it was relatively small, both as a platform and as a company. Created by David Baszucki and Erik Cassel in 2004 and released in 2006, the platform hosts user-created games of multiple genres coded in the programming language Lua. Roblox ( / ˈ r oʊ b l ɒ k s/) is an online game platform and game creation system developed by Roblox Corporation that allows users to program games and play games created by other users. Game creation system, massively multiplayer online

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