An online mode allows treasures to be traded between registered friends. Rarer items cost more ID points than others. Any items collected during a stage must be identified at the end of the stage by using Sonic's 'ID points'. There are 242 items in the game, some of which can be gained by opening treasure chests in the stages. In stages where this is not required the townsperson will reward Sonic with an item. In some stages, it is required to give a specific amount of rings to townspeople before reaching the goal. Doing so correctly will take away twenty of Sonic's rings and give them to the townsperson, and in return, he receives a gift at the end of the stage. By interacting with these characters the player may do a quick-time button input. The stages feature townspeople that cheer the player on, and some that Sonic can interact with these actions and the player's deeds will be judged at the end of each stage, updating his 'knight ranking' accordingly. Unlike Sonic and the Secret Rings, however, Sonic's movement is controlled with the analog stick, making forward and backward movement more streamlined. Unlike other 3D Sonic games, Sonic cannot turn around, and is funneled into a set path automatically, only able to strafe left and right, move and backflip in reverse, or keep running forward. Gameplay is heavily inspired from Sonic and the Secret Rings with many of the same abilities and restrictions shared exclusively between the two games. Swordplay is implemented through the Wii Remote. Gameplay differs from traditional games in the Sonic series by mixing in the new element of swordplay with the traditional Sonic platforming and speed. Sonic grinding on the railroad in the Molten Mine Sonic and the Black Knight was de-listed from retailers in 2010, following Sega's decision to remove all Sonic series titles with sub-average Metacritic scores in order to increase the value of the brand. Sonic and the Black Knight received mixed reviews, with praise for its graphics, presentation and abundance of bonus content, but criticism of the game's controls, swordplay mechanics and multiplayer aspect.

Set in the world of King Arthur, the game combines Sonic's trademark speed with a new sword fighting system, utilizing the Wii Remote's motion-sensing functionality. The game was released on the Wii as the second entry in the Sonic Storybook series, following Sonic and the Secret Rings (2007). Sonic and the Black Knight is a 2009 platform game developed by Sonic Team and published by Sega as part of the Sonic the Hedgehog series. Platformer, action-adventure, hack and slash

Sonic and the black knight soundtrack