The aim of the game is to draw a monster by playing the game.
When playing, you learn vocabulary (body parts, colours, clothes). This is great practise for all young kids learning English as a second language. For native speakers it is fun for the creative (drawing) part of the game.
Throw the dice and draw everything the game tells you to draw.
You can play it with a pair or alone, if you wish. It doesn't matter if the monster has five arms and legs and seven eyes in the end. It is a monster after all.
Finally, you can decorate the classroom with all the terrific monsters the students have drawn.