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  • Games Bracket City is an addictive new word puzzle game Ellsworth Toohey
  • Morsle.com, with today's solution obscured
    brain teasers This addictive Morse code game is the new Wordle you never knew you needed Ellsworth Toohey
  • From Martin Gardner's
    optical illusions Brain-bending experiment reveals why kids struggle with writing Mark Frauenfelder
  • animation Dudolf's adorable seek-and-find drawings hurt my brain Gail Sherman
  • Multiple Choice Probability Puzzle
    puzzles This multiple choice probability puzzle has been causing arguments for years Mark Frauenfelder
  • puzzles Can you solve the "infinite gold" math puzzle Mark Frauenfelder
  • useful stuff Excellent cheap puzzle book: The Moscow Puzzles: 359 Mathematical Recreations Mark Frauenfelder
  • brain teasers Challenge — can you get these cups unstuck? Mark Frauenfelder
  • math How many triangles do you see? David Pescovitz
  • brain teasers Can you figure out what number comes next? Carla Sinclair
  • brain teasers Puzzle – how to ensure you get the quarter, not the penny Mark Frauenfelder
  • puzzles Can you solve the seven planets riddle? David Pescovitz
  • puzzles Can we wrap a 1x1x1 cube with the blue 3×3 piece of paper, cutting along some edges without disconnecting it? Mark Frauenfelder
  • puzzles Can you solve the virus riddle? Mark Frauenfelder
  • puzzles A hat puzzle Mark Frauenfelder
  • brain teasers Brain teaser: draw a cross inside the grid Mark Frauenfelder
  • brain teasers Puzzle: The Candy Thief Mark Frauenfelder
  • math The best place to sit in a "suicide circle" if you really don't want to die Mark Frauenfelder
  • puzzles The best book of physics brain teasers Mark Frauenfelder
  • puzzles The Missing Dollar puzzle from Martin Gardner's Aha! Gotcha book series Mark Frauenfelder
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