• 4▸ A word's points and which way it runs, on its first letter. Red while hidden, 4▸ teal once cracked. Two markers on one square: two words start there.
• Dark tiles are face down. A green dotted letter on one is proved: a guess boxed it.
• A red ring round a face-down tile means some letters are ruled out there. Each guess box lists them underneath.
• A letter in a gold box is a blank: it stands in for that letter and is worth nothing.
• Coloured squares are the districts of Calder. The purple ✻ in the middle is where the first word goes.
• The bar under your name is the chase: the red run is the mastermind's score heading for 🏁 the getaway, the teal line is the detectives' catching up.

B Box: right letter, right spot.
L Line: in the word, wrong spot.
M Grey: not in the word (or not that many times).

The keyboard keeps score the same way, and greys out letters the sum rules out: a word worth 2 has no Q in it.

Box every letter and the word is cracked: it turns face up, and every word crossing it gets letters for free. A word whose letters are all proved cracks itself, no guess spent.

Tap one to switch. ✓ marks a daily you've played today.