How to play Hares.

1. Every row, column and block holds each number once. That much is the number square you already know. A meadow with nine rows has nine columns and nine blocks of three by three; on Monday and Tuesday the meadow is six by six, with blocks of two rows by three columns.

2. Hares leap like a knight. Two burrows a knight's leap apart, two one way and one across, never hold the same number. The leap reaches over rows, columns and blocks alike: a burrow far away can still rule a number out. From Friday on, hares also refuse to sit next to the same number in any direction, corners included.

3. Every meadow has exactly one filling that fits every rule. The numbers the meadow gives you are heavier and sit a shade darker. When the last burrow is right, the game notices by itself.

A note is your own guess, not the game's. Notes narrow down what you are still considering for a burrow; the game never marks one wrong while you play, only when you ask with Check, in two steps: it first says how many numbers are wrong, then, on a second press, marks them. Hold and drag from a burrow that already holds a number to write it into the empty burrows you pass.

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

Every meadow opens with steps like these. Hint finds the next one for you, shades the row, column and block it is reading and the leaps it counted, and says why; press it again to write the number in. Hints are counted and shown when you finish, never hidden.

• One number left. A burrow whose row, column, block and every hare within reach have already taken every other number has just one left.
• A number with nowhere else to go. When a number fits only one burrow of a row, a column or a block, that is where it goes, even if that burrow could still hold other numbers on its own.
• Held in place by the leap. Sometimes a number is forced into one burrow of a line only once the knight's leap, or on the king days the touching rule, is counted in.
• A one step trial. Write a number in, follow it one step, and drop it if it runs into a contradiction. The hardest days lean on this the most.