ANGLE DETECTIVE

Radical Methods for Solving the Shot Angle Mysteries of Pool and Snooker

A comprehensive angle-recognition and aiming training system taught through a book, reinforced by a video game, and supported by precision printable tools.

The Book

ANGLE DETECTIVE: Radical Methods for Solving the Shot Angle Mysteries of Pool and Snooker is an instructional book that introduces a new approach to recognizing and understanding shot angles.Rather than relying on feel-based guesswork, the book teaches structured geometric methods that train players to identify shot angles clearly and consistently at the table, using practical recognition tools and patterns that apply directly to real play.The book is designed for serious pool and snooker players, instructors, and anyone seeking a deeper, more reliable way to understand shot geometry.Available in Black & White paperback, with an optional full-colour paperback edition for readers who prefer colour illustrations.

Links to Buy on Amazon

Black & White Paperback

Full Colour Paperback

The Video Game

The ANGLE DETECTIVE video game is a free 3D angle-recognition training game for pool and snooker players, designed to train the eye.Unlike traditional billiards games, Angle Detective presents each shot as a visual puzzle. Players study randomized shot layouts, identify the correct angle, and then compare their answer against the true geometric solution.A powerful Practice Mode allows players to select any angle from 0° to 90° and rapidly cycle through infinitely generated shot layouts at that exact angle, making it ideal for deeply ingraining visual angle recognition.The game reinforces the concepts taught in the book while also functioning as a standalone visual training tool for players who want to sharpen their shot-reading skills at the table.

Play the Angle Detective video game on Windows and macOS. Android and iOS releases are planned for mid-late 2026. Click the link below to learn more and to download the game. Enjoy!

The Tools

ANGLE DETECTIVE Precision Printable Tools

Download the complete set of ANGLE DETECTIVE printable training tools — free.

Each tool is explained step by step and introduced in proper sequence and context in the ANGLE DETECTIVE book.These carefully designed tools can be printed on any standard printer and taken to the table to improve your game. The Angle Detective system does not require physical tools, but these optional training aids can help clarify concepts and speed learning.

Choose your sport below. Each download contains the complete set of precision-scaled printable tools matched to the official ball diameters of your sport.Files are identical across download services. If any link becomes unavailable, simply try another — all files are mirrored for reliability.

17 Pool Tools (982 KB)

17 Snooker Tools (987 KB)

9 Carom Tools (463 KB)

Several tools include repeated design elements called Label Placement Objects (LPOs). These appear as dashed concentric circles and are intended to receive standard adhesive reinforcement labels (such as Avery 6734). Any reinforcement label will work, provided the punched holes are properly centered.Some tools also include smaller concentric circles designed to hold inverted golf tees. When selecting tees, choose ones that stand perfectly upright when inverted on a flat surface and remain centered when rotated. This ensures accuracy during use.

List of Included Tools

  • Master Square

  • Reference Aims

  • Reference Rectangles

  • Reference Rectangles Subsquares

  • Reference Shot Marker Left

  • Reference Shot Marker Right

  • Reference Shot Marker Left (Ledger/A3 size)

  • Reference Shot Marker Right (Ledger/A3 size)

  • Frangle Rock

  • RotoThroBro

  • RotoThroBro (Ledger/A3 size)

  • RotoThrotractor

  • RotoThrotractor (Ledger/A3 size)

  • The Gauntlet

  • The Gauntlet (Ledger/A3 size)

  • PortaGuards

  • Throtractor

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© 2025 Jeff Nisnick. All rights reserved.