From GameBrew - a wiki dedicated to Video Game Homebrew.
PYIN-PYANG is a Yin-Yang Pong for the Nintendo DS. It is a 2 players game (no player-vs-computer mode) and does not use WiFi.
It has the same rules as tennis table, which you are able to move the platform in all directions without crossing to the opposite field.
The rules are explained at the Help section of the homebrew.
D-Pad - Move white racket (Player 1)
A/B/X/Y - Move black racket (Player 2)
- First release available the 26th of October, 2007.
- Author's website - http://www.andreani.net/ds/pyin-pyang.htm