| fillomino(noun, game, entertainment, riddle) |
| folding puzzle(expression, game, toy, conundrum) |
| four glasses puzzle(expression, game, entertainment, riddle) |
| futoshiki(noun, game, entertainment, riddle) |
| gear cube(expression, game, entertainment, riddle) |
| god's algorithm(expression, game, entertainment, riddle) |
| goishi hiroi(expression, game, entertainment, riddle) |
| gokigen naname(expression, game, entertainment, riddle) |
| hardest logic puzzle ever(expression, game, entertainment, riddle) |
| hashiwokakero(expression, game, entertainment, riddle) |
| helicopter cube(expression, game, entertainment, riddle) |
| hero's heart(expression, game, entertainment, riddle) |
| heyawake(noun, game, entertainment, riddle) |
| hidato(noun, game, entertainment, riddle) |
| hitori(noun, game, entertainment, riddle) |
| hotaru beam(expression, game, entertainment, riddle) |
| individual puzzle pieces(expression, game, toy, conundrum) |
| induction puzzles(expression, game, entertainment, riddle) |
| inshi no heya(expression, game, entertainment, riddle) |
| isolate(noun, game, entertainment, riddle) |