If you know what this is, welcome back to your childhood.
If you never seen this before, here's your chance.
This is a pretty easy build, and inexpensive too.
1x3x8 Pine - 2 pieces
Nails or Screws or Glue
Small piece of hardwood (for pucks and sticks) 1/2" thick
Step 1: Cut the base
You can use a table saw or circular saw. Regardless of tool, cut it as square as possible.
Whew, that was hard.
Step 2: Cut the Sides
Again, use the cutting tool of your choice.
Step 3: Cut the Ends
We need two of these, 24" long.
In addition, you need to cut an arch for the goal.
Find the center of the board, and draw an arch that is approximately 4 inches wide. Cut this out with your jigsaw. You can take the cut out and then use it as a template for the other end.
Step 4: Corners and Goalies
The corner pieces allow you to ricochet smoothly around the corners. And the goalies provide defense from straight on shots.
The corners are approximately 2.5" on the legs of the triangle. The goalies are approximately 2.5" square.
Use some scrap from you 1x3 to cut these pieces.
Step 5: Assembly
Make sure your hardboard is SMOOTH SIDE UP. Or else you will not have any fun playing nok hockey.
You can glue them down with a strong adhesive like Gorilla Glue, but you'll have to clamp it.
Or you can use a bead of wood glue and then screw or nail from the bottom.
(2) Attach the sides the same way.
(3) Fasten the end piece into the side piece.