| mastermind(noun, game, entertainment, riddle) |
| masyu(noun, game, entertainment, riddle) |
| mathematical puzzle(expression, game, toy, conundrum) |
| mathematics of sudoku(expression, game, entertainment, riddle) |
| mechanical puzzle(expression, game, toy, conundrum) |
| mindtrap(noun, game, entertainment, riddle) |
| missing dollar riddle(expression, game, entertainment, riddle) |
| missing square puzzle(expression, game, toy, conundrum) |
| missionaries and cannibals problem(expression, game, entertainment, riddle) |
| monkey and banana problem(expression, game, entertainment, riddle) |
| mutilated chessboard problem(expression, game, entertainment, riddle) |
| national puzzlers' league(expression, game, toy, conundrum) |
| navigrid(noun, game, entertainment, riddle) |
| nikoli(noun, game, entertainment, riddle) |
| nonogram(noun, game, entertainment, riddle) |
| numberlink(noun, game, entertainment, riddle) |
| nurikabe(noun, game, entertainment, riddle) |
| on the trail of the golden owl(expression, game, entertainment, riddle) |
| paper-and-pencil puzzle(expression, game, toy, conundrum) |
| pazurgo(noun, play, game, entertainment) |