• ### D.1. Logic II

3. #### D.1.1. Extreme Principle I

1. D.1.1.1. Largest product – two numbers
2. D.1.1.2. Largest (or smallest) Sum
3. D.1.1.3. Largest product – several numbers
4. D.1.1.4. Digital sum
5. D.1.1.5. Matching Keys
6. D.1.1.6. Mixed Practice
4. #### D.1.2. Optimization

1. D.1.2.O. Overview
2. D.1.2.1. Frying pancakes
3. D.1.2.2. Efficiency
4. D.1.2.3. Complex Transportation
5. #### D.1.3. Multiple Pile Problems

1. D.1.3.O. Overview
2. D.1.3.1. One pile at a time.
3. D.1.3.2. Multiple Pile Problems II
• Add a specific skill individually
• ### D.2. Logic III

3. #### D.2.1. Pure Logic 2 (Very difficult)

1. D.2.1.O. Overview
2. D.2.1.1. Digit Comparison
3. D.2.1.2. Making Values
4. D.2.1.3. Releasing Captives and Swapping Numbers
5. D.2.1.4. Number Theory
6. D.2.1.5. Miscellaneous
• Add a specific skill individually
• ### D.3. Logic IV

3. #### D.3.1. Clocks and watches

1. D.3.1.O. Overview
2. D.3.1.1. Given the time
3. D.3.1.2. Changing Angles
4. D.3.1.3. Slow, Fast, and Broken Clocks and Watches
4. #### D.3.2. Extreme Principle II

1. D.3.2.1. Sending Messages
2. D.3.2.2. Busses
3. D.3.2.3. Larger Product without Calculation
4. D.3.2.4. Creating Numbers
5. D.3.2.5. Boxes
6. D.3.2.6. Mixed Practice
5. #### D.3.3. Reduction Games

1. D.3.3.1. Reduction Games
• Add a specific skill individually
• ### D.4. Logic I

3. #### D.4.1. Pure Logic 1

1. D.4.1.1. Orderings
2. D.4.1.2. Faces of Cubes
3. D.4.1.3. Pulling Items
4. D.4.1.4. Crossing Rivers
5. D.4.1.5. Crossing Rivers With Animals
6. D.4.1.6. Family Time
7. D.4.1.7. Growing Bamboo
8. D.4.1.8. Liars and Truth-Tellers
9. D.4.1.9. Pairings
10. D.4.1.10. Matchings
11. D.4.1.11. Cats Eating Fish
12. D.4.1.12. Potpourri
• Add a specific skill individually
• ### D.5. Logic II

3. #### D.5.1. Simple Working Backwards

1. D.5.1.1. Basic Arithmetic