This electronic handheld Sudoku puzzle with dry-erase grids is easy to use with a clear LCD display, three levels of difficulty and hints to answers. Players can handwrite answers on the laminated grids provided. There are three card sets for children, intermediates and seasoned players. It even saves unfinished puzzle grids in its memory and allows users to check individual square answers with a special “reveal” function. There is a Hall of Fame too for players with maximum scores. There are 10 double-sided grid cards (20 grid patterns) over 6 x 6, 9 x 9 and 12 x 12 grid formations, with three difficulty levels per grid type.