Top solvers can try their hand at the One-Sided Gordonian Rectangle, Extended Gordonian Rectangle, Gordonian Polygon, and Alternating Digits. (But they can take comfort in knowing that no more than one will occur in any single puzzle).

In stock
  • Color
  • No Color
  • Gtin
  • 9781402743993
  • Item_group_id
  • 16836106
  • Age_group
  • Adult
  • Condition
  • NEW
  • Gender
  • Unisex
  • Sku
  • 9781402743993USA
  • Promotion_id
  • 19942445,19942511,19943042,19943043,19943076,19943143,19943189,19943347
  • Shipping
  • US:::10.95
  • Sale_price
  • 11.99

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