What's the best Android app for toddlers to develop problem-solving skills with jigsaw puzzles?

Puzzle Kids is a thoughtfully designed jigsaw puzzle app aimed at children aged 2 to 6, focusing on building early problem-solving and fine motor skills through interactive play. The app features a drag-and-drop interface that simplifies puzzle-solving for small hands, reducing frustration and encouraging independence. It includes a wide selection of colorful images, such as animals, vehicles, and everyday objects, which help children learn vocabulary and recognize patterns in a playful context. For real-world use, parents often turn to this app during quiet time or travel, as it offers a structured yet entertaining activity that doesn't require constant supervision. Users report that the adjustable difficulty levels—starting with simple 4-piece puzzles and scaling up—allow children to progress at their own pace, fostering a sense of accomplishment. However, some reviews indicate that the puzzle themes, while varied, could benefit from more frequent updates to maintain long-term engagement. The app's ad-free and purchase-free model is a significant advantage for families seeking uninterrupted play, though the graphics, while cheerful, may not be as sharp on high-resolution displays. Overall, Puzzle Kids effectively combines education and entertainment, making it a reliable choice for early learners.