Volume 1:
100 - The 3n + 1 problem
101 - The blocks problem
102 - Ecological Bin Packing
103 - Stacking Boxes
105 - the skyline problem
106 - Fermat vs. Pythagoras
107 - The Cat in the Hat
108 - Maximum Sum
111 - History Grading
113 - Power of Cryptography
116 - Unidirectional TSP
118 - Mutant Flatworld Explorers
119 - greedy gift givers
120 - Stacks of Flapjacks
136 - Ugly Numbers
138 - street numbers
146 - ID Codes
151 - Power Crisis
154 - Recycling
160 - Factors and Factorials
Volume 2:
200 - Rare Order
202 - Repeating Decimals
278 - Chess
Volume 3:
305 - Joseph
344 - Roman Digititis
Volume 4:
458 - The Decoder
494 - kindergarten counting game
Volume 5:
562 - dividing coins
Volume 6:
674 - coin change
Volume 9:
900 - brick wall patterns
Volume 100:
10071 - Back to High School Physics
Volume 117:
11777 - Automate the Grades
100 - The 3n + 1 problem
101 - The blocks problem
102 - Ecological Bin Packing
103 - Stacking Boxes
105 - the skyline problem
106 - Fermat vs. Pythagoras
107 - The Cat in the Hat
108 - Maximum Sum
111 - History Grading
113 - Power of Cryptography
116 - Unidirectional TSP
118 - Mutant Flatworld Explorers
119 - greedy gift givers
120 - Stacks of Flapjacks
136 - Ugly Numbers
138 - street numbers
146 - ID Codes
151 - Power Crisis
154 - Recycling
160 - Factors and Factorials
Volume 2:
200 - Rare Order
202 - Repeating Decimals
278 - Chess
Volume 3:
305 - Joseph
344 - Roman Digititis
Volume 4:
458 - The Decoder
494 - kindergarten counting game
Volume 5:
562 - dividing coins
Volume 6:
674 - coin change
Volume 9:
900 - brick wall patterns
Volume 100:
10071 - Back to High School Physics
Volume 117:
11777 - Automate the Grades