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Mysterium Riven Logic Puzzle

dswhite42
Mar 28th, 2020
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  1. 1. There are 5 islands, arranged in a line from left to right
  2. 2. Gehn is on Survey Island
  3. 3. Atrus has a linking book to Tomahna
  4. 4. Nelah is wearing a dagger on her belt
  5. 5. Crater Island is immediately to the left of Jungle Island
  6. 6. The person on Crater Island is wearing a scarf
  7. 7. The person with birds on their island has a Myst linking book
  8. 8. Beetles are on Temple Island
  9. 9. Someone has a pendant on the island in the middle of the line
  10. 10. Cho is on the island farthest to the left
  11. 11. Ytram frogs can be found on the island next to the island that has a Tay linking book
  12. 12. Beetles are on the island next to the island that has a K'veer linking book
  13. 13. The person wearing glasses is on an island with Webbers
  14. 14. Catherine is on an island surrounded by Wahrks
  15. 15. Cho is on the island next to Prison Island
  16. 16. The person wearing a timepiece is next to the island that has Ytram frogs
  17.  
  18. ------------------------------------------------------------
  19.  
  20. The first few steps are easy, and we can write these down immediately:
  21. (9) Someone has a pendant on the island in the middle of the line
  22. (10) Cho is on the island farthest to the left
  23. (15) Cho is on the island next to Prison Island
  24.  
  25. That puts a pendant on Island #3 (the middle one), and Cho on Island #1, which means Prison Island is Island #2
  26.  
  27. +===========+=============+=============+=============+=============+=============+
  28. | Island # | 1 | 2 | 3 | 4 | 5 |
  29. +===========+=============+=============+=============+=============+=============+
  30. | ISLAND | | Prison | | | |
  31. +-----------+-------------+-------------+-------------+-------------+-------------+
  32. | PERSON | Cho | | | | |
  33. +-----------+-------------+-------------+-------------+-------------+-------------+
  34. | ACCESSORY | | | pendant | | |
  35. +-----------+-------------+-------------+-------------+-------------+-------------+
  36. | ANIMAL | | | | | |
  37. +-----------+-------------+-------------+-------------+-------------+-------------+
  38. | BOOK | | | | | |
  39. +-----------+-------------+-------------+-------------+-------------+-------------+
  40.  
  41. Next comes a pair of clues we take together. Start with:
  42.  
  43. (5) Crater Island is immediately to the left of Jungle Island
  44.  
  45. Crater Island can’t be Island #2 either, which we know is Prison Island. Nor can it be Island #1, because it would not be to the left of Jungle Island. So we only have two possibilities left:
  46. - Crater Island is Island #3, Jungle Island is Island #4
  47. - Crater Island is Island #4, Jungle Island is Island #5
  48.  
  49. Which is it? Let’s take the next clue:
  50.  
  51. (6) The person on Crater Island is wearing a scarf
  52.  
  53. Crater Island has a scarf, but we already know that the accessory on Island #3 is a pendant. So that only leaves one possibility: Crater Island is Island #4, Jungle Island is Island #5. That also means the scarf is on Island #4.
  54.  
  55. +===========+=============+=============+=============+=============+=============+
  56. | Island # | 1 | 2 | 3 | 4 | 5 |
  57. +===========+=============+=============+=============+=============+=============+
  58. | ISLAND | | Prison | | Crater | Jungle |
  59. +-----------+-------------+-------------+-------------+-------------+-------------+
  60. | PERSON | Cho | | | | |
  61. +-----------+-------------+-------------+-------------+-------------+-------------+
  62. | ACCESSORY | | | pendant | scarf | |
  63. +-----------+-------------+-------------+-------------+-------------+-------------+
  64. | ANIMAL | | | | | |
  65. +-----------+-------------+-------------+-------------+-------------+-------------+
  66. | BOOK | | | | | |
  67. +-----------+-------------+-------------+-------------+-------------+-------------+
  68.  
  69.  
  70. (2) Gehn is on Survey Island
  71.  
  72. He can’t be on Island #1 because Cho is there. So Gehn is on Island #3, and Survey Island is Island #3. And since we’ve eliminated all but one island, that means Temple Island is Island #1.
  73.  
  74. +===========+=============+=============+=============+=============+=============+
  75. | Island # | 1 | 2 | 3 | 4 | 5 |
  76. +===========+=============+=============+=============+=============+=============+
  77. | ISLAND | Temple | Prison | Survey | Crater | Jungle |
  78. +-----------+-------------+-------------+-------------+-------------+-------------+
  79. | PERSON | Cho | | Gehn | | |
  80. +-----------+-------------+-------------+-------------+-------------+-------------+
  81. | ACCESSORY | | | pendant | scarf | |
  82. +-----------+-------------+-------------+-------------+-------------+-------------+
  83. | ANIMAL | | | | | |
  84. +-----------+-------------+-------------+-------------+-------------+-------------+
  85. | BOOK | | | | | |
  86. +-----------+-------------+-------------+-------------+-------------+-------------+
  87.  
  88.  
  89. The next clues are easy:
  90.  
  91. (8) Beetles are on Temple Island
  92. (12) Beetles are on the island next to the island that has a K'veer linking book (i.e. Island #2, Prison Island)
  93.  
  94. +===========+=============+=============+=============+=============+=============+
  95. | Island # | 1 | 2 | 3 | 4 | 5 |
  96. +===========+=============+=============+=============+=============+=============+
  97. | ISLAND | Temple | Prison | Survey | Crater | Jungle |
  98. +-----------+-------------+-------------+-------------+-------------+-------------+
  99. | PERSON | Cho | | Gehn | | |
  100. +-----------+-------------+-------------+-------------+-------------+-------------+
  101. | ACCESSORY | | | pendant | scarf | |
  102. +-----------+-------------+-------------+-------------+-------------+-------------+
  103. | ANIMAL | Beetles | | | | |
  104. +-----------+-------------+-------------+-------------+-------------+-------------+
  105. | BOOK | | K'veer | | | |
  106. +-----------+-------------+-------------+-------------+-------------+-------------+
  107.  
  108.  
  109. Now a couple of tricky clues:
  110.  
  111. (4) Nelah is wearing a dagger on her belt
  112. (13) The person wearing glasses is on an island with Webbers
  113.  
  114. What accessory item can go on Island #1 with Cho? We’ve already placed the pendant and scarf on other islands. It can’t be the dagger, because Nelah has it. And not the glasses, because Island #1 has beetles, not Webbers. By process of elimination, the timepiece must be on Island #1.
  115.  
  116. +===========+=============+=============+=============+=============+=============+
  117. | Island # | 1 | 2 | 3 | 4 | 5 |
  118. +===========+=============+=============+=============+=============+=============+
  119. | ISLAND | Temple | Prison | Survey | Crater | Jungle |
  120. +-----------+-------------+-------------+-------------+-------------+-------------+
  121. | PERSON | Cho | | Gehn | | |
  122. +-----------+-------------+-------------+-------------+-------------+-------------+
  123. | ACCESSORY | timepiece | | pendant | scarf | |
  124. +-----------+-------------+-------------+-------------+-------------+-------------+
  125. | ANIMAL | beetles | | | | |
  126. +-----------+-------------+-------------+-------------+-------------+-------------+
  127. | BOOK | | K'veer | | | |
  128. +-----------+-------------+-------------+-------------+-------------+-------------+
  129.  
  130. And now this clue becomes easy:
  131.  
  132. (16) The person wearing a timepiece is next to the island that has Ytram frogs
  133.  
  134. That puts the ytram frogs on Island #2. And we can now go back to the two earlier clues #13 above:
  135.  
  136. (4) Nelah is wearing a dagger on her belt
  137. (13) The person wearing glasses is on an island with Webbers
  138.  
  139. The only place where glasses and Webbers can go together is Island #5. And by elimination, we deduce that the dagger is on island #2, and from clue #4, that means Nelah is on Island #2.
  140.  
  141. +===========+=============+=============+=============+=============+=============+
  142. | Island # | 1 | 2 | 3 | 4 | 5 |
  143. +===========+=============+=============+=============+=============+=============+
  144. | ISLAND | Temple | Prison | Survey | Crater | Jungle |
  145. +-----------+-------------+-------------+-------------+-------------+-------------+
  146. | PERSON | Cho | Nelah | Gehn | | |
  147. +-----------+-------------+-------------+-------------+-------------+-------------+
  148. | ACCESSORY | timepiece | dagger | pendant | scarf | glasses |
  149. +-----------+-------------+-------------+-------------+-------------+-------------+
  150. | ANIMAL | beetles | Ytram frogs | | | Webbers |
  151. +-----------+-------------+-------------+-------------+-------------+-------------+
  152. | BOOK | | K'veer | | | |
  153. +-----------+-------------+-------------+-------------+-------------+-------------+
  154.  
  155. (14) Catherine is on an island surrounded by Wahrks
  156.  
  157. Catherine can only be on island #4 or #5, but we know Webbers are on island #5. Therefore Catherine and Wahrks are on island #4. And by elimination, we know know that Atrus is on Island #5. We’ve eliminated the other animals too, so birds must be on Island #4.
  158.  
  159. +===========+=============+=============+=============+=============+=============+
  160. | Island # | 1 | 2 | 3 | 4 | 5 |
  161. +===========+=============+=============+=============+=============+=============+
  162. | ISLAND | Temple | Prison | Survey | Crater | Jungle |
  163. +-----------+-------------+-------------+-------------+-------------+-------------+
  164. | PERSON | Cho | Nelah | Gehn | Catherine | Atrus |
  165. +-----------+-------------+-------------+-------------+-------------+-------------+
  166. | ACCESSORY | timepiece | dagger | pendant | scarf | glasses |
  167. +-----------+-------------+-------------+-------------+-------------+-------------+
  168. | ANIMAL | beetles | Ytram frogs | birds | Wahrks | Webbers |
  169. +-----------+-------------+-------------+-------------+-------------+-------------+
  170. | BOOK | | K'veer | | | |
  171. +-----------+-------------+-------------+-------------+-------------+-------------+
  172.  
  173.  
  174. Almost done!
  175.  
  176. (7) The person with birds on their island has a Myst linking book
  177.  
  178. That puts the Myst book on Island #3.
  179.  
  180. (3) Atrus has a linking book to Tomahna
  181.  
  182. That puts the Tomahna book on Island #5
  183.  
  184. (11) Ytram frogs can be found on the island next to the island that has a Tay linking book
  185.  
  186. That puts the Tay book on Island #1
  187.  
  188. +===========+=============+=============+=============+=============+=============+
  189. | Island # | 1 | 2 | 3 | 4 | 5 |
  190. +===========+=============+=============+=============+=============+=============+
  191. | ISLAND | Temple | Prison | Survey | Crater | Jungle |
  192. +-----------+-------------+-------------+-------------+-------------+-------------+
  193. | PERSON | Cho | Nelah | Gehn | Catherine | Atrus |
  194. +-----------+-------------+-------------+-------------+-------------+-------------+
  195. | ACCESSORY | timepiece | dagger | pendant | scarf | glasses |
  196. +-----------+-------------+-------------+-------------+-------------+-------------+
  197. | ANIMAL | beetles | Ytram frogs | birds | Wahrks | Webbers |
  198. +-----------+-------------+-------------+-------------+-------------+-------------+
  199. | BOOK | Tay | K'veer | Myst | | Tomahna |
  200. +-----------+-------------+-------------+-------------+-------------+-------------+
  201.  
  202.  
  203. Which means that the Releeshan book is with Catherine on Island #4, Crater Island.
  204.  
  205. +===========+=============+=============+=============+=============+=============+
  206. | Island # | 1 | 2 | 3 | 4 | 5 |
  207. +===========+=============+=============+=============+=============+=============+
  208. | ISLAND | Temple | Prison | Survey | Crater | Jungle |
  209. +-----------+-------------+-------------+-------------+-------------+-------------+
  210. | PERSON | Cho | Nelah | Gehn | Catherine | Atrus |
  211. +-----------+-------------+-------------+-------------+-------------+-------------+
  212. | ACCESSORY | timepiece | dagger | pendant | scarf | glasses |
  213. +-----------+-------------+-------------+-------------+-------------+-------------+
  214. | ANIMAL | beetles | Ytram frogs | birds | Wahrks | Webbers |
  215. +-----------+-------------+-------------+-------------+-------------+-------------+
  216. | BOOK | Tay | K'veer | Myst | Releeshan | Tomahna |
  217. +-----------+-------------+-------------+-------------+-------------+-------------+
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