How to play memory game

First of all, write number of words you want to play.
Aim is to find all the matching pairs of picture and word. At start, all the pictures and words are face down. Click the boxes to uncover them. If the last picture and word don't match, they will again turn face down. Repeat till you uncover all the pairs.

The game is also known as Concentration, Pelmanism, Shinkei-suijaku, Pexeso and Pairs.