The game is played in pairs. Each player has their own duck sheet like the one below.
A player rolls a die and places a pattern block on their duck according to what they roll from this sheet, which I cut in half. (Click on the graphic for your own copy.)
Here are the official directions.
I simplified it slightly. I didn't tell them they could exchange shapes. If they couldn't use the shape they rolled, they lost their turn, but true to the directions above, they were not allowed to move any shape after it had been placed.
They loved the game, and I loved that they could play it over and over again with very different results each time. They had a ton of exposure to shapes and their attributes.
P.S. The duck template was found at Prekinders.com/pattern-blocks but as you can see, all lines within the picture were removed. Obviously, their removal ups the ante and allows this activity to really be about composing and decomposing.