I've been playing Hidden Letters for about three weeks now, and it's become my go-to app when I need to decompress. The core gameplay is simple: you search for letters hidden in detailed black-and-white illustrations, and each found letter gradually fills the image with color. What makes it stand out is how thoughtfully designed it is—the background music is genuinely calming, and there's no timer or pressure to perform. I often play while waiting for appointments or during my commute, and it's remarkable how it turns fragmented time into something productive yet relaxing. One thing I appreciate is the variety in artwork. From nature scenes to intricate patterns, each puzzle feels fresh. The 'aha' moment when you spot a cleverly hidden letter is oddly satisfying. That said, the free version does limit how many pictures you can color daily unless you watch optional ads or make in-app purchases. While understandable for developer support, some users might find this restrictive if they binge-play. Still, the overall experience feels generous compared to many ad-cluttered games. The developer, Venosa Games, clearly prioritized user comfort—there are no pop-up ads during gameplay, just optional ones between puzzles. For anyone who enjoys word searches but wants something more visually rewarding, this is a brilliant hybrid. It’s not going to challenge your vocabulary like a crossword, but it delivers exactly what it promises: a peaceful, engaging escape.