The Mines design has varied over the course of the Sonic series. However, they generally resemble metallic orbs with spikes on their surface.
In gameplay, whenever a playable character makes contact with a Mine, it will cause them to take damage and lose Rings. Additional effects may also occur, depending on the game.
Sonic Drift series
The mine made its first appearance in Sonic Drift. In this game, the Mines resemble round and black metal balls with gray spikes on them and a blue stripe around their equator.
In gameplay, Dr. Robotnik has the ability to drop Mines on the race tracks while racing after collecting two Rings. Touching a Mine in this game makes the playable character come to a temporary stop and spin uncontrollably in addition to losing Rings.
Sonic Drift 2
In Sonic Drift 2, the Mines appear in greater quantity. In this game, they retain their design from Sonic Drift, meaning they resemble black metal balls with gray spikes on them and a blue stripe around their equator.
In gameplay, Mines can be encountered during the underground sections with the Yellow Drill on Planet Wisp. Also, in Versus Mode (the multiplayer mode of Sonic Colors), the player can drop Mines on top of opposing players with the MineItem Box. Touching a Mine in this game causes the Mine to explode and damage the playable character.