Verdix

A logic grid puzzle is worth solving only when two things are true of it: exactly one

answer fits the clues, and every clue is needed to get there. A puzzle book runs out

after sixty of them. Generated ones rarely run out, and rarely hold up either: half the

sheet turns out to be clues that were already implied by the clues above them.

Verdix picks the hidden truth first, four suspects paired to four weapons and four

rooms, and then builds the case backwards from it. Candidate clues, all of them true of

that truth, are handed to a solver one at a time until the solver can pin every cell

without guessing. Then the list is walked back through and every clue the solver turns

out not to need is thrown out. What that leaves is a case proved to have exactly one

answer, proved reachable by deduction alone, and stripped of anything decorative: take

away any single clue and it stops being solvable.

WHAT IT DOES

• Every case proved to have one answer and pruned to a minimal set of clues
• Sixteen classes of clue, from a plain denial through either-or, neither-nor, room

order and adjacency, weapon weight, exactly-one-of and if-then

• Three tick-and-cross grids, paged by a tab strip rather than a swipe, because a swipe

and a drag are the same gesture until the moment it ends

• Aim, then tap: the first tap frames a cell wider than itself so it stays visible

around a fingertip, the second cycles it through tick, cross and unknown

• A tick clears the rest of its row and column, which is what a pencil does a second

later anyway; it can be switched off

• A clue page that shows one clue at a time and files each one away once it is spent
• An accusation names a suspect, a weapon and a room; three wrong calls close the case

and the grids fill in with the answer

• A hint that names the next cell already forced, and which clue forces it
• A daily case, the same one on every watch, and free cases that never run out
• Best time daily and free, streak, best run, win rate and a difficulty reading
• Five languages, on-watch settings, nothing sent anywhere

WHAT IT NEEDS

Nothing but the watch. No phone, no signal, no account.