I started with the Instructable from Kyle Brinckerhoff;

https://www.instructables.com/id/Ardu-pong-the-Arduino-based-pong-console/

Thanks Kyle!

and the following at Make magazine
http://blog.makezine.com/archive/2007/08/arduino-pong.html

and I see the original code is attributed to Pete Lamonica

Thanks Pete!!

I am using the paddles instead of the joy stick and I have made it for 2 players. Also I added some sound.

I put the electronics in an Iphone box .

Step 1: Video of the Game

Step 2: What I Used

I used the following:

Iphone box
Arduino - I had a Freeduino from Solarbotics that I used. The picture shows another but I am sure others would work fine.
Atari paddles - I had from an old system being stored in the basement. I see them on eBay.
An old RCA cord that was in my big box of misc cords
A 9 pin D connector that I got at Radio Shack - pn 276-1538
Also (not shown)
RCA plugs for the cable to attach to - had in my pile of broken things
resistors
75 ohm
1Kohm
330 ohm
2 10k ohm pull down resistors

Some misc hardware - wire, screws,small pieces of wood

Step 3: Prepare the Box

I started with a small piece of wood which I cut to fit inside the box. The idea was I would secure everything to this piece and then secure the box to the wood. Holes need to be cut to fit the RCA plugs, the 9 pin connector, and for a USB cable which is needed to attach to Arduino .

I glued another small piece of wood to the larger to be used as a place to secure the Arduino.

Step 4: Electronics Part1 - the RCA Plugs

Following the instructions from Kyle's Instructable, I soldier a 1k ohm and a 330 ohm resistor to the center pin of the video out RCA jack.
I also connected the 75 ohm that is shown in the diagram . It made the picture a little less bright but much clearer and it stopped a lot of the flickering.

The RCA plug for the sound is straight forward: The center plug goes to Arduino pin 11 and the ground side goes to ground.

The bottom part of the diagram is different than what I did.

Step 5: Electronics Part2 - Connections to Arduino

Basically
Analog pin 1 - goes to paddle 1
Analog pin 2 - goes to paddle 2
Ground - used to ground the 9 pin connector, the RCA connectors
5v goes to the 5 v on the 9 pin connector

Digital pin2 - goes to the button on Paddle 1(button on paddle 2 is not used)
Digital 8 - goes to video RCA
Digital 9 - goes to video RCA
Digital 11 - goes to sound RCA

Step 6: Electronics Part3 - the 9 Pin Connector

Struggled with this but more through trial and error than anything else, I got to the following:

Looking at the pins from the back of the connector:
The top row (left to right)
pin1 - goes to analog 0
pin 2 - not used
pin 3 - goes to Digital 2 - the button
pin 4 & pin 5 - not used

bottom row(left to right)
pin 6 - goes to analog 1
pin 7 - goes to ground
pin 8 - goes to 5 v
pin 9 - not used