From GameBrew - a wiki dedicated to Video Game Homebrew.
PairsDS is a classic matching pairs game for the NDS. It is played with holding NDS vertically (turning 90 degrees to the left).
The game contains 6 different themes. Find and match the squares of the same color to clear the squares in order to revile the image at the back.
Mainly control with Stylus.
Start - Return to menu (after completing the puzzle)
Tested on Original R4 (firmware 1.19).