These can be used as differentiated activities for a selection of more able students in a mixed ability group. The aim is that the students should be able to work through the activities without needing too much teacher support.

In order that the students can get feedback on their work for each activity there is a discussion of answers which is for the students. This can be used for students to check their own work or to help them review the work of other students.

Activity	Puzzle 1	Puzzle 2	Puzzle 3	Teacher notes	Answers	Template
Crude oil sudoku
Ionic sudoku
Elemental sudoku