Types of puzzles

1. DOUBLET is a puzzle which tranfer one meaningful word to another meaningful word by changing one letter in each step.

Condition : word in each step should be meaningful & transfer within minimum steps

Example : HEAD to TAIL

               HEAD

               HEAL

               TEAL

               TELL

               TALL

               TAIL

2. TANGRAM is a puzzle set consisting of 7 rearrangable pieces. The aim of the puzzle is to form a figure using those 7 tangram pieces. The figure may be a mathematical shape or animal and so on with definite shape.