Assembly

Make a Square
Make Your Bed!
Markus' Tetrahedron
Matchbox Puzzle - Snooker Balls
Matchbox Puzzle - T-Time Puzzle
Matchbox Puzzle - The Cross
Matchbox Puzzle - The Knot
Matchbox Puzzle - The Pyramid
MATH
Math Maker
Matrix 6
Matrix 8
MATT Puzzle
Megiddo
Ménage à trois
Merkaba
Meson
Meteor
Microbes Attack!
MIddle Slice
Mini Eco Bamboo Brain Teaser #5
Mini Splice
Mintaka