10 books • 3 series
Book #1: Project Safe Journal
Book #8: Project Vault 7 Day Journal
Book #1: The Sudoku Master Vol. 1
Book #2: The Sudoku Master Vol. 2
Book #3: The Sudoku Master Vol. 3
Book #5: The Sudoku Master Vol. 5
Book #6: The Sudoku Master Vol. 6