Letter Stack is a word game available on the iPhone platform. The game, developed by BOOM GAMES YAZILIM VE TICARET ANONIM SIRKETI, is free to play and falls under the games category. In Letter Stack, players create words by dragging and dropping letters to clear the letter stack. It offers a challenging and engaging experience for those who enjoy word games.

Players can test their vocabulary and strategic thinking skills as they progress through levels by forming words from the provided letters. Letter Stack provides a fun way to pass the time while also stimulating the mind with its word-building mechanics.