Introduction

Rule details

Basic knowledge

Basic rules

• Rule of adjacent "3 and 0"
• Rule of adjacent "3 and 3"
• Rule of diagonal "3 and 3"
• Rule of corner "3"
• Rule of corner "2"
• Rule of corner "1"
• Practice 1

General rules

• Drawing a line to a corner of "3"
• How to draw a line out of a corner of "3" when two lines are already connected in L-shape
• Drawing a line to a corner of "1"
• How to draw a line out of a corner of "1" when two "x" are already marked in L-shape
• Drawing a line to a corner of "2"
• Rule of diagonal "2s"
• Rule of diagonal "32..23"
• Practice 2

Strategical rules

• How to extend a line from a corner of "3"
• Off-limits

  ----Currently under work----

• The total number of unconnected lines' end in an area always must be even