What Is a Visual Puzzle? Kinds, Rules and a Worked Example
A visual puzzle is solved by looking, comparing, folding or turning shapes. Its main kinds, how it differs from other puzzles, and what makes one fair.
Riddle10 blog
Articles about counting shapes
How Many Squares Puzzle: Count Squares, Rectangles and Triangles
Count shapes size by size. A step-by-step method for squares, rectangles and triangles, with quick rules, a worked grid and a practice puzzle.