Critical Thinking Worksheets for Ages 9-10: Mastermind Academy Logic Puzzle Pack

Mastermind Academy is a 24-page critical thinking activity book for children aged 9 to 10. Children join Professor Yogi's secret Academy as agents. Each of 20 missions opens one padlock on the Vault door, and when all 20 locks are open the Mastermind Trophy is theirs. A Vault tracker on page 2 shows progress, and a fold-over Agent ID card makes the start feel real.

The puzzles go deeper than a typical puzzle book. Children defend an odd one out with a reason, find the rule in woven number sequences, break a code in as few guesses as possible, solve a four-by-four logic grid with an either-or clue, crack Calcudoku cages, work out who tells the truth on Robot Island, tile a vault door with pentominoes and decide who owns the robot fish in a street of eight clues. Every logic puzzle is checked to have exactly one answer.

Real-world pages get children thinking outside the book. Make a pigpen cipher decoder, plan and run a fair test with paper helicopters, measure optical illusions with a ruler, play yes-or-no lateral thinking mysteries, build a hexagon spinner for a family debate and escape the Professor's study with a five-lock final code.

The pack ends with a Mastermind Graduate certificate and a full answer key with explanations. Colour and black-and-white editions are both included. Print single-sided and use thin card for the cut-out pages. It suits homeschool, after-school clubs and puzzle-loving children who have outgrown simple logic worksheets.