Grab an antigravity pencil and blast off into the final frontier of interstellar sudoku The head scientist at NASA (the National Aeronautics and Sudoku Administration), Francis Heaney, takes solvers on an unforgettable journey to the edge of the universe. There, puzzle-nauts will see stars in “Stellar Sudoku,” chase comets in “Orbital Sudoku,” and bend time and space in “Alternate Universe Sudoku,” among other out-of-this-world sudoku variants.