- Antifreeze (Solution)
- Consecutive Birthdays (Solution)
- Cube Numbers (Solution)
- Don't Spend It All At Once (Solution)
- Hands of a Clock (Solution)
- How Old Is My Daughter? (Solution)
- The Striking Clock (Solution)
- Relations (Solution)
- School Notes (Solution)
- Simple Algebra (Solution)
- A Dinner Party (Solution)
- Dominoes on Board (Solution)
- An Unusual Series (Solution)
- Is the Rope Knotted? (Solution)
- The Two Rugs (Solution)
- Mexican Table Mats (Solution)
- The Curious Sequence (Solution)
- Colored Labels (Solution)
- War in the Middle Ages (Solution)
- How Many Are We? (Solution)
- Jaws (Solution)
- Meteorology (Solution)
- Amateur Doctor (Solution)
- Bar Flies (Solution)
- Subway Escalator (Solution)
- Lighthouse (Solution)
- The Demonstration (Solution)
- Year of Birth (Solution)
- Spanish Arithmetic (Solution)
- A Story of 1's and 2's (Solution)
- How Many Children Were You? (Solution)
- Brother and Sister (Solution)
- Ursula and the Cats (Solution)
- New Math (Solution)
- Chinese Numbers (Solution)
- The Smallest Possible (Solution)
- For Those Under 16 (Solution)
- Product (Solution)
- Riverside Drive (Solution)
- Summit Meeting (Solution)
- A Bag Of Marbles (Solution)
- The Five Numbers (Solution)
- 100! (Solution)
- House of Cards (Solution)
- Lunch With Friends (Solution)
- Thirty-two Cards (Solution)
- Checker Pattern (Solution)
- Odd or Even (Solution)
- Five Times Five (Solution)
- Largest Product (Solution)
- Multiple Choice (Solution)
- A Square Number (Solution)
- Reverse Multiplication (Solution)
- Odd Product (Solution)
- Carnival Dice (Solution)
- Sum Cubes (Solution)
- Tower of Squares (Solution)
- Sum to 30 (Solution)
- The King's Fortune Telling Scale (Solution)
- Knights of the Round Table (Solution)
- Photographers and Cannibals (Solution)
- Handshakes (Solution)
- Bookworm (Solution)
- Match Game (Solution)
- Where There's a Will (Solution)
- Rope Trick (Solution)
- Alphabet Soup (Solution)
- All Wet (Solution)
- The Telltale Number (Solution)
- Something Fishy (Solution)
- The Baffling Bicycle (Solution)
- Figure Eight (Solution)
- The Balancing Brick (Solution)
- The Scrambled Salesman (Solution)
- Wrong Number (Solution)
- Magic Numbers (Solution)
- Case of the Counterfeit Coins (Solution)
- Strange Series (Solution)
- Boxed In (Solution)
- Weighty Question (Solution)
- Early Bird (Solution)
- Take a Letter (Solution)
- Water and Milk (Solution)
- Four Sheep (Solution)
- Do Helmets Increase Head Injuries? (Solution)
- Sons (Solution)
- Dinner for Three (Solution)
- One Clock (Solution)
- The Mongolian Postal Service (Solution)
- The Amorous Commuter (Solution)
- Short Roads (Solution)
- A Weighty Problem I (Solution)
- A Weighty Problem II (Solution)
- Eight Years Old (Solution)
- Cover That Hole (Solution)
- Pond Problem (Solution)
- River Problem I (Solution)
- River Problem II (Solution)
- The Bicycles and the Fly (Solution)
- Where does the square go? (Solution)
- Siblings (Solution)