Three levels of difficulty with grids ranging from 6x6 up to 14x14, including rectangular grids. All the grids are randomly generated for a virtually inexhaustible number of puzzles. Smaller grids are great for younger players or if you just want a quick game. Larger grids will provide a challenge to even the best puzzle solvers. Grids can be zoomed in and out using a spread and pinch motion to easily complete large grids even on smaller devices.