Monkey Ball meets Lemmings, in a tub of water.
It's funny how a single game can validate a whole controller. Or at least get pretty close.
The gameplay is simple. Everything happens on a single screen. You see a tub filled with water and plenty of ducklings lounging about. The player has to pick up the ducklings by hitting them with his duck and steering them towards the drain. While the tub is always shaped like a rectangle, it can have different layouts inside and lack walls in certain places (resulting in the duck falling off, if you are not careful).