Ducks, also known as Blocks, or simply Pink Squares are enemies that appear in Geometry Wars: Retro Evolved 2 and Geometry Wars 3: Dimensions. They also appear in Geometry Wars: Waves, a minigame in Project Gotham Racing 4, yet appeared red rather than the usual pink color. They resemble two squares conjoined together and are the color of pink.
Ducks move very slow and can only move up and down randomly. They are generally not considered much of a threat. However, if they appear in large groups, they will pose a danger to players who do not acknowledge them.