Five Star Gift Ideas

One idea could be to purchase a book of Sudoku puzzles with varying levels of difficulty, so that your friend can keep challenging herself/himself. Another idea could be to purchase a custom-made Sudoku board, which would allow your friend to easily keep track of her/his progress and work on Sudoku puzzles wherever she/he goes. You could also consider gifting a Sudoku app or subscription to an online Sudoku platform, which would give your friend access to a wide variety of puzzles and challenges. Additionally, you could consider gifting her/him a Sudoku-themed mug or keychain, to add a fun and personal touch to the gift.

Or you can get her/him a star map with an important date you share.