SPOILERS Batman Secret Files #2 riddle.

Finished reading “Alone” in Batman Secret Files #2. Has anyone solved the riddle? I came up with “U Kant play alone”. The “U” from the football field, “Kant” from the employees in the diner, “Play” from the theatre sign, and “alone” from the marked monitors in Riddler’s hideout. Has this been confirmed or debunked anywhere?

What is the riddle?