Puzzle 130: Rising sun (2013) Puzzle 129: Steam locomotive (2012) Puzzle 128: A Geometric Xmas tree (2012) Puzzle 127: Square vs Annulus (2011) Puzzle 126: A troublesome sequence (2011) Puzzle 125: A mathematical shield (2011) Apr-May 10: A chopping problem Dec-Nov 09: The mark of Zorro July-Sept 09: Radiolarian's shell May-June 09: Square vs circle Jan-Feb 09: Congruent cheese shapes Sept-Oct 08: Perpendicular or not? July-Aug 08: Ratio of similar triangles May-June 08: Geometry of the bees Febr-March 08: The Parrot sequence Januray 2008: Strange birthdates Oct-Nov 2007: Infinite beetle path Aug-Sept 07: Indecisive triangle June-July 07: Achtung... Minen! Apr-May 07: Soccer balls Febr-March 07: Prof Gibbus' angle Jan 07: Triangles to square Aug-Sept 2006: Balance problem June-July 06: Squared strip Apr-May 06: Intriguing probabilities Febr-March 06: Cows & chickens Dec 05-Jan 06: Red monad Sept-Oct 2005: Magic star July-Aug 05: Cheese! May 05: Stairs to square Febr 05: Same pieces Sept-Oct 2004: Odd triangles June 04: Pizza's pitfalls May 04: Pacioli puzzle... April 04: Inscribed rectangle March 04: Magic 4-T's Febr 04: A special box Dec-Jan 04: Curvilinear shape... Oct-Nov 2003: Same area? well... Sept 03: Square vs rectangle June 03: Magic bagel Apr 03: Granitic thoughts Feb 03: Elementary, my dear... Jan 03: Hands-on geometry... Oct 2002: Improbable solid... Sept 02: Kangaroo cutting... July-Aug 02: Shaved or not... June 02: Rectangle to cross... May 02: Labyrinthine ways... Apr 02: Just numbers... March 02: Enigmatic solid... February 02: True false... Dec-Jan 02: Egyptian architecture... Nov 2001: Binary art... Oct 01: Crank calculator... Sept 01: A cup of T... Aug 01: Topological problem... July 01: Every dog has 3 tails... June 01: Slice the cake... May 01: Question of reflection... April 01: Visual proof... March 01: Diagonal of a 4D cube... February 01: Some path problems... Dec-Jan 01: How many squares... Oct-Nov 2000: Syntemachion puzzle... September 00: Leonardo's puzzle... August 00: Drowned by numbers.. July 00: Funny tetrahedrons... Apr-May 00: 3 smart discs in 1... March 00: Triangular differences... February 00: Cheeta tessellating puzzle... Dec-Jan 00: Rhombus puzzle... Oct-Nov 1999: Curved shapes to square... September 99: Hexagon to disc... August 99: Logic? Schmlogic... July 99: Jigsaw puzzle April 99: Minimal dissections March 99: Permutation problem... February 99: Another square root problem... January 99: Less is more, a square root problem December 98: The cunning areas November 98: The incredible Pythagora's theorem October 98: The multi-purpose hexagon September 98: The impossible squarings August 98: The irritating 9-piece puzzle
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