| bear |
| brain twister |
| brainteaser(difficulty, question, secret, puzzle, obscurity) |
| braintwister(difficulty, question, secret, puzzle, obscurity) |
| case(noun, information, cause, reason, idea) |
| certification(noun, information, reason, picture, evidence) |
| chapter and verse(noun, expression, idiom, information, cause) |
| charade(difficulty, question, secret, puzzle, obscurity) |
| chiller(difficulty, question, secret, puzzle, obscurity) |
| circuit |
| cliffhanger(difficulty, question, secret, puzzle, knot) |
| clincher(noun, information, reason, picture, evidence) |
| comes |
| confirmation(noun, information, reason, picture, evidence) |
| corroboration(noun, information, reason, picture, evidence) |
| cryptogram(difficulty, question, secret, puzzle, knot) |
| demonstration(noun, information, cause, reason, base) |
| deposition(noun, information, reason, picture, evidence) |
| design(noun, cause, purpose, basis, planned) |
| determinant(noun, cause, reason, base, call) |