Techniques

Ways to find the next number, from the last gap in a row to 3D Medusa. Each one comes with a board that needs it.

The basics

  1. Full houseThe last gap
  2. Naked singleOnly one number fits
  3. Hidden singleOnly one place left

Lines and boxes

  1. Locked candidatesStuck in one line
  2. Empty rectangleEmpty rectangle
  3. Chute remote pairsTwin pairs

Pairs and triples

  1. Naked pairTwo squares, two numbers
  2. Hidden pairTwo numbers, two squares
  3. Naked tripleThree squares, three numbers
  4. Hidden tripleThree numbers, three squares

Fish

  1. X-WingX-Wing
  2. Finned X-WingFinned X-Wing
  3. Finned SwordfishFinned Swordfish
  4. SwordfishSwordfish

Wings

  1. Y-WingY-Wing
  2. XYZ-WingXYZ-Wing
  3. W-WingW-Wing
  4. WXYZ-WingWXYZ-Wing

Colours and chains

  1. Simple colouringTwo colours, one number
  2. XY-ChainA chain of pairs
  3. X-CyclesStrong and weak links
  4. 3D MedusaTwo colours, every number

Groups and crossings

  1. Aligned pair exclusionNo partner left
  2. ALS-XZTwo nearly-full groups
  3. Death BlossomA stem and two petals

One answer only

  1. Unique rectangleThe one-answer rectangle
  2. Hidden rectangleThe rectangle, from a corner
  3. BUG+1The odd one out