The Antigravity is an unseen object that can be can be equipped to Sonic's Custom Shoes. When obtained, it allows Sonic to perform the Sliding Attack, allowing him to squeeze under tight spaces or attack enemies. This Level Up Item is required to reach the Dusty Desert stage.
- If the player looks close enough, they may notice that Sonic hovers a little above the ground while sliding, which can also explain why Sonic doesn't eventually slow down while sliding.
- Official in-game description.