Jul 05, 2013 - Push Poke is excited to announce the release of Letter Stack Free 1.1 for iOS. Letter Stack Free is a fast-paced word stacking game where you challenge friends to see who can unjumble and stack words the fastest. Bringing a unique mixture of physics and word games, you drag and stack the letter blocks to form words, but be careful not to knock down your stack. The faster you stack words, the more points you get. Challenge your friends in three, one-minute rounds - highest score wins!