SOS Mission

SOS Missions are a subject that appears in Sonic Forces. They are additional, optional objectives that the player can choose to complete. Completing SOS Missions will allow the player to unlock Avatar items as a part of their Challenge Mission rewards

Overview
SOS Missions are optional tasks that the player-controlled characters in Sonic Forces can complete in a so-called "SOS Stage". SOS Stages are regular stages in the game that are chosen to be the sites of these Missions. In the context of the game's storyline, SOS Missions represent SOS signals from members of the Resistance that are in need of help.

SOS Missions come in three kinds, each one represented by one of the following colors: SOS Missions will start appearing on the World Map screen (also known as the stage select screen) after clearing Green Hill. A SOS Mission becomes available at random after completing a stage or exiting a menu. The color of SOS icon next to the Stage Target for the SOS Stage indicate the type of Mission.
 * Red: In these Missions, the player must clear a SOS Stage using a brand new Avatar different from the player's own (the player's own Avatar will not be available). The new Avatar will be the one that sent the SOS signal. Along with the new Avatar, the player is also given a different Wispon.
 * Green: In these Missions, the player must clear a SOS Stage while using a Rental Avatar (an Avatar with their independent Wispon that the player can swap out with their own during gameplay). The Rental Avatar will be the one that sent the SOS signal.
 * Blue: In these Missions, the player must use either Modern Sonic, Classic Sonic or their Avatar to search the SOS Stage for a Capsule containing the Avatar that sent the SOS signal. Once the Capsule is found, free the trapped Avatar and clear the SOS Stage in order to complete the Mission.

If the player loses a life, quits the game or clears the SOS Stage without clearing the SOS Mission, the player will fail the Mission without the option to retry. Leaving to the Main Menu will also remove all SOS Missions that were currently on the World Map.