Sudoku for kids, or anyone else who likes logic puzzles. Since sudoku is just that, a logic puzzle, there's no reason for it to require numbers, which can be intimidating for little kids. So, you can use numbers, but also fun shapes, letters, and sea creatures as game pieces. Simple drag and drop game play levels from 3x3, 4x4, 6x6, and 8x8 game boards at different difficulty levels within each set. And you can play for hours with a few hundred unique puzzles to complete.
Free on Google Play: Download
From concept to app store, Kidoku is a personal project completed with development help from a friend and occasional co-worker. While not monetarially useful, it was a rewarding experience to create my own version of a game and see the reviews from strangers saying that they or their kids love playing the game.