Chemistry Su Doku Greetings Cards (Cards)

"Chemistry Su Doku Greetings Cards" are a fun new way to send a greeting! These special cards feature a Su Doku puzzle, with chemical elements in place of numbers. Whether it's for a birthday, a special occasion, or just for fun, send them to friends and family and let them navigate their way through the Su Doku grid! Each pack contains eight different cards, complete with envelopes, and are blank for you to write your own message. Each card features a different key element, with interesting facts about the elements on the reverse of the card. For example, did you know that there the name 'helium' is derived from the Greek 'helios', meaning 'sun'? Want to get your friends or family into chemistry? Or simply know someone you would like to challenge? Then why not send them a "Chemistry Su Doku Greetings Card"?!