While you can only buy Robux (Roblox currency), there are no real ways to earn them for free. However, there is a technique that can help you make some Robux in exchange for your Game Pass.

Create new Gamepasses and get them listed in PLS Donate from here (Image via Roblox) Next, click on the "Create a Pass" button and select a proper name, image, and description for your Gamepass.

Roblox Pass the Bomb is a Battle Royale-style experience that mashes two classic kids’ games together: Tag and Baton Pass.