Every puzzle has one answer.
You get to prove it.
PLANIGMA is a collection of logic puzzle books. A Victorian house with a body in one room, a youth baseball team with one right lineup every game: different stories, the same promise. Every puzzle is checked by computer against every possible arrangement before it goes to print.
See the books Try a case first
Paperbacks · 8.5″ × 11″ · full colour interiors
Floor-plan mysteries
Mystery Puzzles
A house, a floor plan, a handful of statements, and one person left in the room with the body. Every case is proved, never guessed.
Halmerton House Victorian London, 1880s
One Victorian house in Belgravia and the people who cannot leave it. Every book explains its own rules and stands on its own, and every case in it has exactly one answer.
Logic on the pitch
Sport Puzzles
A team, a stack of player cards, a scouting report, and one lineup that fits it. A whole season of logic, one game at a time.
You Make the Lineup! Baseball logic puzzles for kids 8-12
Coach the Halmerton Foxes, a 12U youth team, through a full spring season. Every game has exactly one right lineup, and every clue is on the page.
You Make the Lineup! Basketball Basketball logic puzzles for kids 8-12
Coach the Halmerton Herons, a youth team where everyone plays, through a full season. Set the rotation before every game, crack the box score after it: every puzzle has exactly one answer.
Why the seal is on every cover
Not checked. Exhausted.
Most puzzle books tell you there is one answer. These have counted. Before a puzzle is allowed into a PLANIGMA book, proprietary software lays out every legal arrangement, the guests on a floor plan or the players in a lineup, and tests the clues against each one in turn.
That is what the seal means. It is a measurement, not a promise.