Below is a recommended sequence for Marcy Cook books for use as stumpers. The books are listed in sequential order from younger grade levels to higher grade levels.
BOOKS FOR STUMPER PROBLEMS
K  2 SHOW ME & STUMP ME
1  3 PROBLEMS PER PRIMARY PUPILS
2  4 PRIMARY STARTERS & STUMPERS
2  5 THINKNTOUCH: HANDLES FOR PROBLEM SOLVING
3  6 CRACK THE CODE, BOOK A
4  8 CRACK THE CODE, BOOK B
4  8 FORM AN EQUATION
4  8 MATH STARTERS & STUMPERS
4  8 MORE STARTERS & STUMPERS
4  8 TILE TEASERS
5  8 SEE THE C’S: CLOCKS, CARDS, CALENDARS, COINS, CALCULATIONS & CONUNDRUMS
