Sudoku by HumbleLogicGames is a minimalistic and addictive puzzle game available on Android. The app offers players access to the most complete mobile Sudoku learning system in the world. The game is based on a logic-based, combinatorial number-placement puzzle, originally called Number Place.

The app features five different difficulty levels, ranging from Picnic to Expert (Insane), each with a unique solution. The intelligent hint system allows players to learn new skills and strategies. Sudoku also offers unlimited undo/redo, support for phones and tablets, and can be played online or offline. The app has a small APK size and automatically saves and resumes games. Best of all, it is completely free.

It is worth noting that the app contains banner and interstitial ads. However, they don't interfere with the gameplay and can be removed with a small in-app purchase.

Overall, Sudoku by HumbleLogicGames is a great choice for anyone looking for a challenging and addictive puzzle game on their Android device.