You will need:
Mix up all the monster movers on a table so you don't know which is which
Place all the square monster cards face down on the table.
Playing the game:
If they don't get a match they put the card in a discard pile and it is the next persons turn. The players will want to remember what is under that lid in case they pick that card.
If a "Mix it Up" Monster Mover is uncovered, then everyone shouts "MONSTER MIX-UP!". That person mixes up ALL the movers! The play then goes to the next player.
If the square cards run out, shuffle the discard pile and start over.
The game ends when all the cards are gone (there will be two mix-it-up movers still on the table)
The person with the most matches wins!