This is a fabulous game to develop concentration skills as well as being lots of fun!
Ask your child to stand at one side of the room against the wall. Explain that there is a dungeon which has treasure in it, but the key to the dungeon is guarded by a dragon.
To get the key they must move quietly and slowly and stand completely still if the dragon wakes up. If the dragon sees them move they will have to go back to the beginning.
You play the dragon. Children love it when you really act out the part - e.g. snore when you are asleep, roar and growl if you see your child move etc.