Microsoft Rewards lets you earn points by searching with Bing, playing games, or browsing the web with Microsoft Edge.
Roblox Premium gives you a monthly allowance of Robux and other benefits such as discounts and access to exclusive items.
You can sign up for the Roblox Affiliate Program and receive a commission for every player that makes a purchase.
The Roblox Creator Challenge comprises quizzes and tutorials, guiding you in creating your own Roblox games. Completing it can net you free Robux.
Roblox frequently releases promo codes; you can get them on their official Twitter or Discord accounts.