- Casket, Lady Isabel's, 67, 191.
- Cats and Mice, 75.
- Cellarer, The Riddle of the, 73, 196.
- Cellarman, The Perplexed, 122, 222.
- Chalked Numbers, The, 89, 206.
- Chaucer's Puzzle, 54, 181.
- Cheeses on Stools, 24.
- Chessboard Problems, 21, 25, 32, 51, 72, 82, 90, 113, 114, 116, 119, 124, 138, 141.
- Chessboard, The Broken, 119, 220.
- Chifu-Chemulpo Puzzle, 134, 235.
- Chinese Railways, The, 127, 224.
- Christmas Puzzle Party, The Squire's, 86, 205.
- Cisterns, Making, 145.
- Clerk of Oxenford's Puzzle, The, 29, 167.
- Cliff Mystery, The Cornish, 99, 210.
- Clock Puzzle, 158.
- Cloth, Cutting the, 50.
- Clowns, The Eight, 128, 226.
- Club, Adventures of the Puzzle, 94, 210.
- Coinage Puzzle, The, 111, 214.
- Coin Magic Square, 111.
- Column, The Nelson, 146, 241.
- Combination and Group Problems, 38, 39, 61, 70, 122, 137, 147.
- Cook's Puzzle, The, 36, 171.
- Cornish Cliff Mystery, The, 99, 210.
- Counter Problems, Moving, 24, 35, 69, 77, 124, 135, 136, 141.
- Counting out Puzzle, 39.
- Crescent and the Cross, The, 63, 189.
- Crossing River Problems, 82, 83.
- Crusaders, The Riddle of the, 74, 197.
- Crusoe's Table, Robinson, 142, 240.
- Cubes, Sums of Two, 174, 209.
- Cubes, The Silver, 92, 209.
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