Burr

Placatio
Planks & Small blocks
Polar Burr
Pole Dancers
POPP
Pot van Olen
Programmer's Nightmare
PSI
Puzzlab Burr
Pygmy Puzzle
Quad Slideways Burr
Quadrix
Quadrox
Quantum Entanglement
Quartet 22 S
Rainbow Aluminum Burr
Rana
RAR
Rat Trap
Rattle Twist Duo