Put-together

One way to P.A.R.I.S.
Open Cube
Optimal Tumble
Opus 3
Oskar's Patchwork Box
Pack the Ropes Too
Packing Puzzle 2+2
Panulukan
Peanut Puzzle
Peg Board
Pent Up
Pentadivio
Pentosun
Peppermint Twist
Picasso
Pigeon
Pile'em Up (Six Pieces)
Pincers