This cube is a Sudoku consisting of up to three levels of '2×2 Sudokus' with base colors, circle colors and symbols on all faces. Therefore the cube name means (4×4×4) cubies × 4 base colors × 4 circle colors × 4 symbols.
In its initial state the cube faces are divided into grids of four colored 2×2 boxes. The four different circle colors are arranged as 2×2 Sudokus on two faces, The four different symbols are arranged as 2×2 Sudokus on all six faces. They appear on every row and column exactly once and they also appear exactly once in each 2×2 box.
The cube can be solved in several 2×2 Sudoku stages with several valid solutions.