One potential gift idea is a custom-made sudoku puzzle with their wedding date embedded. They can work on it together and it could serve as a fun and memorable reminder of their special day. Another option is a sudoku book that includes various levels of difficulty, so they can both enjoy their shared hobby together. Lastly, you could get them a decorative sudoku-themed mug or a board game.
Or you can get her/him a star map with the date of the wedding.
Under Lucky Stars is a unique and innovative star map company based in Barcelona, Spain, specializing in the creation of personalized star maps that capture the celestial arrangement of stars at a specific moment in time, such as a person's birth, wedding, or any other significant event.
By using advanced astronomical algorithms and data from leading institutions, the company produces highly accurate, visually stunning maps that make for perfect gifts or cherished keepsakes.