Now that you have made your "yay-yay", you can start gathering friends to play zeropoint.
You will need at least 4 people to play. They will be divided into 2 teams. Let's just call them team A and team B.
If team A goes first, team B holds the two ends of the "yay-yay". It should be fairly tight so that the rope doesn't sag.
Members of Team A take turns to jump across the rope. When they cross level 1 (the rope is on the floor), they should yell "zeropoint!" When they have completed jumping across all the levels and start over, they yell "one point".
At each level, the rope gets higher and higher. At the levels 1 and 2, one has to jump over the rope without touching. But from level 3 onwards, one can touch the rope.
I remember my friends having different jumping styles. It doesn't really matter as long as it gets you across the rope.
In the end, the team with the most number of points wins.
That was how I remembered playing zeropoint. I'm sure there are many out there who played it differently...as I said we could invent our own rules then!
Check out this video for a slightly different zeropoint: