His puzzles have appeared in 592 outlets, including 113 publications in 32 countries outside the UK.

Another puzzle appeared as a tribute in the Toughie series in the Telegraph.

A second such puzzle appears in Hell's Schoolroom.

This approach is slightly linear, but the puzzles appear to be solvable in any order, and in a variety of ways.

And this puzzle appears to be one we will solve with a lot of blood.

Each puzzle or challenge appears in its own "room" or area, which are integrated into a larger game world.

Macnutt died in 1971, and puzzle 1200, his final crossword to be published, appeared in 1972.

The puzzle appears to have been resolved by a team from Cornell University that has found the missing water.

The oldest known mechanical puzzle comes from Greece and appeared in the 3rd century BC.

Word Up: A crossword puzzle appeared on the Videowriter.