Sonic using Crouch in Cool Edge.
A variation of Slide that allows the user to crawl under obstacles.
In order for the player to use this move, he must not be moving, but rather standing still. The player must then press and hold the button used to Slide, but Sonic will duck down on all fours. The player can move about freely while holding the button, but Sonic will crawl on all fours instead of walking. This move cannot be performed by the Werehog.
In earlier Sonic the Hedgehog games, such as Sonic the Hedgehog (1991) and Sonic the Hedgehog 2, holding the down button while standing still causes Sonic to crouch/duck. Unlike Sonic Unleashed, Sonic cannot move around while crouching. This move returns in Sonic Generations (Classic Sonic only).
Another variation of this move appears in Sonic Colors and Sonic Generations (Modern Sonic only). Pressing the Slide button while standing still will cause Sonic to Crouch, but attempting to move will result in a Slide.