Math Magic is a web site devoted to
original mathematical recreations. If you have a math puzzle, discovery, or observation, please email me about it. You can also send answers to the problem of the month. 
Math Magic Archive 
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The corresponding problem for fewest pieces only seems interesting when k=1. What are the best solutions?
You can see all the best known results here.
Submit your answers here.
Weekly Puzzle Sites:   Ken Duisenberg  NPR  Puzzability  The Griddle  Puzzle Picnic  Nick's  
Other Puzzle Sites:   MathPuzzle.com  IBM  Retrograde Analysis  Puzzle Palace  Terry Stickels  
Interactive Puzzle Sites:   Click Mazes  Puzzle Beast  Logic Mazes  Color Shift  Grid 1  2  Boomshine  
PhysicsBased Puzzle Sites:  
Perfect Balance 1 
2 
Assembler 1 
2 
3 
4   Color Infection  Redstar Fall 1  2  Fantastic Contraption  
Colleges with Puzzles:   Macalester  Missouri State  Purdue  
Great Math Sites:   Geometry Junkyard 
Math World 
Mathematician Biographies 
 Integer Sequences  Inverse Calculator  Geometric Dissections  
Recreational Math Sites:   Mike Keith 
Harvey Heinz 
Primes 
GIMPS 
 Polyforms  World of Numbers  Soup Kitchen  