Ultra Stamp

The Ultra Stamp is a special weapon in Splatoon 2. It was released in Version 4.2.0.

Appearance
The Ultra Stamp appears to be an oversized squeaky toy hammer with an ink tank formed from a white-capped plastic jug. Its handle is neon yellow, with the rim between the tank and mallet face on blue. The mallet face and ink tank change color with the user's ink. On the front of the mallet face is a pattern cropped from the SquidForce logo, which is also used as the Regular Battle logo. A white band around the handle has the logo, while the ink tank has the Octopus Oil logo and the Nouveau logo.

Splatoon 2
The Ultra Stamp was announced on 2018-10-29. It was released on 2018-11-07 as part of the update. Preliminary versions of the weapon were found by data miners starting with version, under the codename "SuperStamp".

When activated, the player will hold a gigantic plastic mallet in front of them, which continuously stamps ink on the floor while running and provides cover from the front while leaving the back exposed. Pressing will swing the mallet and strike it on the floor, and holding it down will let the player move forward quickly while splatting enemies in the way. Turning is fairly slow in this state. In the air, players can hit the attack button to swing the mallet once at high speed, which is a smaller yet fairly efficient attack for splatting opponents directly, while pressing will throw the mallet and end the special prematurely.

Trivia

 * The Ultra Stamp was shown in the Version 4.0.0 (Splatoon 2) trailer but neither the nor the  was made available until version Version 4.2.0 (Splatoon 2).