Super simple to put together. Here is the list of what you'll need:
Large baking sheet
White piece of paper a tad smaller than the size of your baking sheet
Tape the white paper to the baking sheet with some drawings to look like a playing field. Next, cut a piece of contact paper larger than the white paper so that the contact paper completely covers the white paper. This will protect the white paper as you do your next step which is add water to the baking sheet. I went half way up with water but you can do less than that. Place in freezer until water is frozen. Word of advice - put the baking sheet in freezer first and than add water. I didn't do this and had to do a balancing act from my sink to the freezer in an effort not to spill the water all over my kitchen floor.
For the hockey sticks use large craft popsicle sticks. For the puck you can use anything around the house like a button. I had a Lego piece and chose to use that
Once frozen take out of freezer and start your own ice hockey game. Both my 8 and 3 year old enjoyed this activity. My 3 year old asked to play later that day and again at night. It's good for eye hand coordination, keeping score and just plain ol' fun! It's still in our freezer and I plan on keeping it there until I need to use the shelf that its on for something else.