Shiversaw is an engine-like robot with a rubber-based pump up front and a gray metal cap on the top and bottom of said pump. The exhausts on these components are seemingly arranged so the front of Shiversaw looks like a face. On its back, it also carries two large freeze tanks, which are connected to its body by black tubes. It also has two round orange shoulders with pole-like gray arms that each carry a circular saw made of ice.
In Sonic Mania, Shiversaw confronted Sonic, Tails and Knuckles when the trio made their way through Dr. Eggman's propaganda factory in Press Garden Zone. Despite Shiversaw's best efforts though, it was still beaten by the trio, causing it to explode upon its defeat and reduce Eggman's factory to rubble.
Shiversaw is capable of levitation and possesses extremely sharp sawblades made from ice. It also has rotatable and telescopic arms, allowing it to stretch its sawblades over a wider area. Should its sawblades get destroyed, Shiversaw can regenerate them as well.
Shiversaw's saws, although sharp, are rather fragile. As such, if it tries to cut through a substance harder than its saws, its saws will shatter instantly.
In Sonic Mania, the Shiversaw is fought with Sonic, Tails or Knuckles. In Sonic Mania Plus, it is fought with Sonic, Tails, Knuckles, Mighty or Ray.
The boss fight starts when the player falls through a collapsing floor into the boss arena. There, Shiversaw will descend into the arena. Upon its arrival, it immediately shatters one of its blades by touching a green and orange crate. Shiversaw's method of attack is using its telescopic arms to extend its sawblades towards the playable characters. When attacking, Shiversaw stands still in midair for a second and beeps before launching its sawblade. Its saw arms can as well rotate to face the player's position around the room, meaning the player cannot attack Shiversaw without its saws getting in the way. This way, Shiversaw is protected from normal attacks.
To beat Shiversaw, the player must lure it into striking either more of the green and orange crates, or the floor. This is accomplished by lining up behind such objects when Shiversaw winds up for an attack. When the attack launches, dodge away and the saw arm that is extended will shatter against the object it hits, stunning Shiversaw and leaving it vulnerable to attacks until it regenerates its saw. Hit this robot six times to make it explode and destroy the printing press factory. The player can then touch the Goal Plate that drops from the sky and finish the Act.
If the player defeats Shiversaw if they activated object placement mode of Debug Mode during the Act, the arena will not explode and the Goal Plate will not be seen (though the Act will still be cleared as normal).
↑ 1.01.1Sonic Mania OST - Press Garden Act 2. YouTube. Sega (11 September 2017). Retrieved on 11 September 2017. “When Team Sonic destroys Shiversaw, Eggman's propaganda printing press is no more, letting them exit to a surreal winter wonderscape filled with cherry blossoms and ancient architecture. Welcome Press Garden's true beauty.”