France

A two-symbol puzzle: on an even-sized grid, place 0s and 1s so each row and column has equal counts of each, no three identical symbols run consecutively, and no two rows or columns are identical.

A mechanical puzzle of linked rings on a handled bar: following two simple rules, take the rings off one by one, or put them back on. The classic nine-ring set takes hundreds of moves.

A 3D interlocking wood (burr) puzzle: notched sticks assemble into a rigid cross without glue; take apart and reassemble.

A one-player pegboard puzzle: jump a peg horizontally or vertically over a neighbor into an empty hole and remove the jumped peg, usually until only one peg remains.

Move a size-ordered stack of disks between three pegs without placing a larger disk on a smaller one.