Design of covers for Sudoku collections

Design of one of 10 covers for a series of Sudoku collections of varying difficulty levels. A common concept was developed for the series. The colors and shapes are selected in such a way as to enhance the emotional and visual recognition of the difficulty level; for example, rounded shapes on the panel emphasize the simplicity of solving tasks, while sharp edges of the star, on the contrary, demonstrate the high complexity of the puzzles. The work was completed in two days.