| No. | Item | Definition |
|---|---|---|
| 1. | acrostic | a puzzle using initial letters |
| 2. | anagram | letters rearranged into another word |
| 3. | analogy | a comparison showing similarity |
| 4. | approach | a way to tackle something |
| 5. | arrange | to put in order |
| 6. | block | an obstacle to progress |
| 7. | brainteaser | a challenging thinking puzzle |
| 8. | breakthrough | a major solving advance |
| 9. | candidate | a possible answer choice |
| 10. | cipher | a coded message or system |
| 11. | clue | a hint toward a solution |
| 12. | code | a system of secret symbols |
| 13. | constraint | a limiting condition |
| 14. | conundrum | a confusing and difficult problem |
| 15. | corner | the meeting point of sides |
| 16. | crossword | a word puzzle in a grid |
| 17. | dead end | a route with no exit |
| 18. | decode | to work out a code |
| 19. | decoy | something meant to mislead |
| 20. | deduce | to infer by reasoning |
| 21. | deduction | reasoning from general to specific |
| 22. | devious | sneakily complicated |
| 23. | distraction | something drawing attention away |
| 24. | edge | the outer border part |
| 25. | elegant | pleasingly simple and effective |
| 26. | eliminate | to remove from consideration |
| 27. | enigma | something mysterious and puzzling |
| 28. | error | a mistake |
| 29. | evidence | facts supporting a conclusion |
| 30. | expert | highly skilled person |
| 31. | find | to locate successfully |
| 32. | fit | to match correctly in place |
| 33. | flip | to turn over |
| 34. | focus | close attention |
| 35. | grid | a pattern of intersecting lines |
| 36. | guess | an uncertain answer |
| 37. | hidden | kept out of sight |
| 38. | hint | a small helpful suggestion |
| 39. | impasse | a point of no progress |
| 40. | impossible | unable to happen or fit |
| 41. | induction | reasoning from examples to rule |
| 42. | inference | a conclusion from clues |
| 43. | ingenious | remarkably clever and inventive |
| 44. | insight | sudden clear understanding |
| 45. | intuition | immediate understanding without proof |
| 46. | invalid | not acceptable under rules |
| 47. | jigsaw | a picture cut into pieces |
| 48. | labyrinth | a complicated winding maze |
| 49. | level | a stage of difficulty |
| 50. | logic | reasoning used to solve problems |
| 51. | master | someone highly skilled |
| 52. | match | to correspond exactly |
| 53. | maze | a network of confusing paths |
| 54. | memory | ability to remember information |
| 55. | method | a way of doing something |
| 56. | mislead | to lead wrongly |
| 57. | narrow | to reduce possibilities |
| 58. | novice | a beginner |
| 59. | observation | careful noticing of details |
| 60. | observe | to watch carefully |
| 61. | obstacle | something that blocks progress |
| 62. | obvious | easy to notice |
| 63. | option | one possible choice |
| 64. | palindrome | a word reading both ways |
| 65. | paradox | a seemingly impossible statement |
| 66. | path | a route through a puzzle |
| 67. | pattern | a repeated or predictable arrangement |
| 68. | piece | one part of a whole |
| 69. | possible | able to happen or fit |
| 70. | process | a series of steps |
| 71. | puzzle | a problem requiring ingenuity |
| 72. | rearrange | to change the order |
| 73. | rebus | a picture-and-letter puzzle |
| 74. | recall | to remember again |
| 75. | red herring | a misleading clue |
| 76. | reveal | to make known |
| 77. | riddle | a puzzling question or statement |
| 78. | rotate | to turn around a point |
| 79. | rule | an instruction to follow |
| 80. | search | to look carefully for |
| 81. | seek | to try to find |
| 82. | sequence | an ordered series |
| 83. | solution | the correct answer |
| 84. | solve | to find the answer |
| 85. | spot | to notice or detect |
| 86. | sudoku | a number-placement logic puzzle |
| 87. | symbol | a sign representing something |
| 88. | tactic | a specific solving method |
| 89. | test | to check by trying |
| 90. | tile | a small game piece |
| 91. | trace | to follow a path |
| 92. | trial | an attempt or test |
| 93. | trick | a deceptive device or move |
| 94. | tricky | deceptively difficult |
| 95. | twist | an unexpected turn |
| 96. | unscramble | to put letters in order |
| 97. | valid | acceptable under the rules |
| 98. | variant | a different version |
| 99. | verify | to confirm as true |
| 100. | wit | quick clever intelligence |
