Each letter you solve and pin in place is a new clue for the surrounding words. Puzzles range from bite-sized fun to brain-busters you can spend a whole afternoon chipping away at, just like a weekend crossword puzzle. About in-app purchases: Crossgrams is free, and contains no ads. It comes with two free sample puzzle packs, and a daily puzzle which is always free. Purchases come in the form of additional larger puzzle packs (plus one for color themes). After careful consideration, our small indie team simply didn't want to make a game filled with ads and distractions. We hope you'll enjoy Crossgrams enough to purchase some packs so we can afford to add more puzzles, and that you'll help us spread the word about the game!