The Octo-Ink, also known as the Octopus Trap (オクトパストラップ,Okutopasutorappu?) is an Action Item that appears in Sonic Free Riders. It is used to obscure opponents' views.
The Octo-Ink takes the appearance of a small and spherical pink robot octopus (akin to the Octus) with a red button on top of its head.
The Octo-Ink can be obtained from the different Item Boxes on the race tracks. When utilizing it, the Octo-Ink releases a squirt of black ink behind the character which becomes a black dome on the ground. If the racers make contact with the ink, their field of vision will be obscured for a short time, making it more difficult for them to race; in the player's case, this effect will obstruct the screen with black ink. However, the player can use wiping hand motion to wipe most of the ink away.
To use the Octo-Ink in gameplay, the player must bring one of their hands up in the air and bring it down.