Gift cards worthless for APP only players! My 5&6 year old boys both like to play Roblox on their tablets and they both have legitimate accounts. They begged me for the gift cards and I followed the instructions on the back of the card (redeemable on web only) . Turns out you can't credit any robux to a player using the app. That player has to log into the web and make purchases that way. (NOT MENTIONED ON THE CARD!) Seriously disappointed!