L-Game

L-Pentomino

Labyrinth

Ladder

Lam turki

Langford Cubes 

Langford Sequence 

Langman Rectangle

Latin-Graeco Square

Latin Cross

Latin Cube

Latin Dominoes

Latin Rectangle

Latin Square

Latruncule

Latruncules

Lattice

Leap Year

Letter

Lettered Small Board

Liar

Liar Paradox

Life

Lindgren Table

Line

Linear Number

Linguistic equation

Link

Liouville Algorithm

Literal Magic Square

Literal Number

Lo Shu Square

Location

Logical Game

Logical Recreation

Loyd Chessboard

Lucas Abacus

Lucas Calendar

Lucas Hundred

Lucas Married Couples

Lucas Number 

Lucas Quadrille 

Lucas Sequence 

Lucky Number

Lune

Mach Book

Mach Cubes

Madelinette

Magic

Magic Circles

Magic Constant

Magic Cross

Magic Cube

Magic Cylinder

Magic Dominoes

Magic Dungeon

Magic Egg

Magic Grid

Magic Heptagram

Magic Hexagon

Magic Hexagonal Mosaic

Magic Hexagram

Magic King

Magic Lattice

Magic Letter

Magic Mill

Magic Number

Magic Octahedron

Magic Octagram

Magic Pentagram

Magic Polygon

Magic Property

Magic Recreation

Magic Rectangle

Magic Sequence

Magic Snake

Magic Square

Magic Sphere

Magic Star

Magic Tetrahedron

Magic Triangle

Magic Tribar

Magic Wheel

Magico-Magic Square

Mailboxes Principle

Main Diagonal

Main Triagonal

Maltese Cross

Map

Map Coloring

Marble

Marienbad

Marriage

Married Couples Crossing

Martingale

Mastermind

Match

Matches Connexion

Mate

Mathematical Game

Mathematical Induction

Mathematical Recreation

Maze

Mechanical Game

Median

Meetings

Mercenary

Méré's Stake

Mersenne Number

Metrodorus Apples

Metrological Recreation

Mikusinski Cube

Military Game

Mill

Minimax

Misaddressed Letters

Misère Form

Missing Ring

Missing Figure

Mixed Game

Mixed Lattice

Mixture

Möbius Band

Möbius Strip

Monabolo

Monad

Moniamond

Monocube

Monohex

Monomino

Monosceles

Moret Calendar

Morpion

Morpion Solitaire

Mosaic

Move

Müller-Lyer Illusion

Multicursal Network

Multicyclic Number

Multidigital Identity

Multidigital Number

Multifoil

Multigrade

Multimagic Square

Multiperfect Number

Multiplane Maze

Multiple

Multiplication

Multiplication Magic Square

Multiplication Table

Multiplicative (Multiperfect Number)

Multipotent (Number)

Multiregular Tessellation

Myrobolam