Also, you will need to achieve Level 10 to use the codes. Once you do that, follow the step-by-step process below to redeem codes for Blue Lock Rivals: Launch the Blue Lock Rivals experience on Roblox ...

How to use the codes for Reverse 1999? You can find the area to input codes by tapping on the dotted, unlabelled menu at the bottom left-hand of your screen while between missions in your suitcase.