Rules

• Join all dots (without exceptions) to form a single loop
• The loop cannot cross or touch itself at any points
• Only horizontal and vertical lines between dots are allowed
• Some parts of the loop are already given

• 
  Examples of Fence puzzles
• 
  Bold lines indicates the connected lines made

Rules

• Join circled numbers with horizontal or vertical lines
• Each number must have as many lines connected to it as specified by its value
• No more than 2 lines may join any pair of numbers and no line may cross
• The finished layout must connect all numbers, so that you can travel between any pair of numbers by following one or more lines

• 
  Examples of bridge puzzle
• 
  Examples of solved bridge puzzle

Rules

• Draw a single horizontal or vertical lines across full width or the height of the center of every white cell
• The total length of all lines touching each black cells must be equal to the number printed on the cell. The length of a line is the number of cells it cover

• 
  Examples of wall puzzle
• 
  Example of solved Wall puzzle

Rules

• Draw a single loop by connecting together some dots so that each numbered square has the specified number of adjacent line segment
• Dots can only be joined by horizontal or vertical lines
• The loop cannot touch , cross or overlap itself in any way.

• 
  Empty slitherlink puzzles
• 
  Solved Slitherlink Puzzles

Rules

• Draw a series of separate path, each connecting a pair of identical numbers
• No more than one line can enter any cell, and line can travel horizontally, or vertically between cells.

• 
  Example of number link puzzles
• 
  Examples of solved number link puzzles

Rules

• Draw a single loop by joining empty cells with horizontal and vertical lines, such that the loop do not revisit any cell.
• Any empty cells which the loop does not visit must be shaded. Shaded cells cannot touch except diagonally
• Arrows in cells indicate exact number of shaded cells in given direction
• Not all of shaded cells are identified by arows

Rules

• Draw a single loop using only horizontal and vertical lines that passes through center of each every circle
• White circle - Pass thru in a straight line
• Black circle - 90 degrees turn
• If the loop hit the wall, need to turn 90 degrees
• The loop cannot enter any cells more than once

• 
  Examples of Masyu solved puzzles