How to play Foxes.

1. One in every row and column. Every row and every column holds exactly one of them: a fox or the lost thing. Nobody can be on a stone.

2. Every clue is true. Together the clues leave exactly one way to place everyone.

3. Alone with it. The fox who ends up alone in a chamber with the lost thing has it. That is the answer to the question under the clues.

Tap a cell, then tap a fox below the board to put it there. Tap Nobody for a cross where no one can be. Switch on Notes to write a fox's letter in the cells where it could still be; drag across cells to pick several at once. On a keyboard, arrows move, the numbers place the foxes and the lost thing, Shift and a number writes a note, X puts a cross, Delete clears, U undoes, R redoes, H asks for a hint, C checks, P pauses.

A wrong fox is shown by Check when you ask, never by the board turning red while you play.

Every lair opens with steps like these. Hint finds the next one for you, outlines where to look and says which clue it uses, without saying who; press it again to take the step. When the same clue comes round again for the same fox, Hint says so and follows it through to where it ends. Hints are counted and shown when you finish, never hidden.

• Read a clue. A clue about one fox tells you where it can be: write its letter there as notes.
• One cell left. A fox with only one cell left goes there.
• Rows and columns. A row with room for just one fox, or with just one open cell, settles itself.
• Two at once. A clue about two foxes rules out every cell where the other one could not fit.
• Alone with it. Once you know the chamber with the lost thing, only one fox can be there.