Metal Sonic is a boss that appears in Sonic Boom: Rise of Lyric and Sonic Boom: Shattered Crystal. In Sonic Boom: Rise of Lyric, it takes place in Slowpoke Isle, and in Sonic Boom: Shattered Crystal it takes place in Ancient Ruins.
Sonic Boom: Rise of Lyric
The battle against Metal Sonic takes place entirely on a speed section. To defeat Metal Sonic, the player must kick big blue-silver ball on the road or the ones that Metal Sonic throws at the player. At the same time, the player must evade left or right to avoid being smashed by walls and jump to avoid Metal Sonic's lasers. After hitting Metal Sonic enough times, he will crash on the road Team Sonic is on, causing the battle to enter a new phase.
In this phase, Metal Sonic's attacks become harder to avoid and he gains new attacks: he will dig along the ground, causing a damaging rip that the player can avoid by moving to the side or jumping, and cause the balls on the grounds to fly at the player, though the latter can be knocked back by hitting them in midair. After getting hit enough times again, Metal Sonic will crash into the road again and a new phase starts.
In this phase, Metal Sonic gains more attacks, like boosting forward and backward at the player at high speed while leaving explosions in his wake. This can be avoided by evading left or right. Additionally, the road will be more difficult than before. After attacking Metal Sonic enough times, he is defeated and the player will win the battle.
Sonic Boom: Shattered Crystal
The battle against Metal Sonic is simple: the player must reach the goal before Metal Sonic to end the battle.