400 Tridoku Sudoku Puzzles : Medium Triangular Sudoku Puzzles
                        
                    
                                                                by Mindful Puzzle Books
                                                                
                                    2020-05-04 14:07:32
                                
                                
                                    
                                
                            
                        
    
                            
                
                                                                            
                                    
                                    
                                    
                                    
                                    
                                    
                                    
                                    
                                    
                                    
                                    
                                    
                                    
                                    
                                    
                                    
                                    
                                    
                                    
                                    
                                    
                                    
                                    
                                    
                                    