15th puzzle, AI solver, endless problem generation, step by step teaching by AI to help you learn how to solve the puzzle, levels are from easy to hard.
* Classical 15th puzzle game, problem is generated all the time, you can play forever.
* AI is built to help you solve any puzzle, you can also learn from AI to understand how the problem is solved.
* Design for beginners and experts to master this number puzzle game.
* No advertisement, simplified interface to focus on solving the puzzle game.
* Different colors to customize the number tile, you can also set the solving speed from AI.
* Stars will be awards once you finish one puzzle.