Game Card Credit can only be used in a browser - it can't be used in the Roblox apps.
From the Membership or Robux purchase pages
- Log into the Roblox account where you redeemed the game card.
- Go to the membership purchase page or the Robux purchase page.
- Select the product you want to purchase.
- Select Roblox Credit as the payment type and click Continue.
- Click Submit Order. Do not re-enter your game card PIN if you have already redeemed your game card.
- If you had enough credit for the full purchase price you will see a confirmation message.
Converting Remaining Credit to Robux
If you have less than $4.99 in remaining credit after making a Robux or membership purchase, you may convert this credit into Robux. This option will only be available when you have less credit than needed to purchase a Robux package.
- Login to your Roblox account
- Click the Gear in the upper right corner to navigate to your Settings page
- Select the Billing Tab
- Click the Convert To Robux button
- You will receive a confirmation screen, click Redeem to complete the conversion.
- Your Robux balance will be updated after refreshing your current page or navigating to a new page.