From GameBrew - a wiki dedicated to Video Game Homebrew.
DUDUDU is a 3D Shot'em up. There are two 3D maps selectable from the menu.
Eliminate all the birds that comes our way.
Control the plane and attack birds or dodge any attack by the birds.
Stylus - control plane, rapid fire
Left/Right - rotate camera
L/R - shoot, select Map
Tested on: Flashcard Supercard DSTWO with Firmware 1.11