Go for The Code-Book C
Get Set for the Code B (Explode the Code)
Get Ready for the Code A (Explode the Code)
Explode the Code 1
Explode The Code : Teachers Guide for Books, A,B,C
Explode the Code Book 2
Beyond the Code Book 1: Comprehension and Reasoning Skills
Get Set for the Code - Book B
Explode the Code 1 1/2
Get Ready for the Code - Book a
Explode the Code 3