A member of the audience is given a "Word-Search Puzzles" book, opens it at any page, finds a word in the puzzle and visualizes it in his mind. The mentalist concentrates for a moment and reveals the thought-of word!
This effect can be repeated as many times as you wish, always with a different word. As a bonus, you also divine the first letter that comes after the chosen word.
For the Grand Finale, the performer replicates the complete puzzle as quickly as possible without a single mistake!