3 differentiated keyword code breakers: atomic structure, mixtures, and changes of state

A pack of 3 keyword code breakers: atomic structure, mixtures, and changes of state. Each one is differentiated to 4 versions from no missing letter to 6 missing letters.
Key word code breakers challenge the students to work out the missing letters in a crossword style grid. All the letters have been replaced by numbers. Students use the clues they are given to add the correct letters into the grid, and to work out the missing letters. There are 4 versions of each code breaker, each version has an increasing number of missing letters.
The code breakers are provided in word format allowing for more letters to be deleted and therefore making the code breaker more difficult.
2 powerpoint slides are provided for each codebreaker. One instruction slide, and one showing the finished code breaker.