Password Screen/System

I am trying to make a traditional password screen via blueprint. I basically want the player to use a letter based system in order to spell out words that would transport the character to different stages. How would I go about making something like this function in blueprints?! I have already made all the required sprites. alt text

Have you looked at building it in UMG? That is going to be the easiest. Otherwise you can always go the hard route and build it in the HUD class (the way we had to do it before UMG).