Player 1 (Terrako): A and D to move right and left, W to jump, S to attack, and F to shoot a beam. Player 2 (Baby Sidon): Right and left arrows to move right and left, up arrow to jump, down arrow to attack, and slash to shoot a beam.
Basically Ultimate Sword battle with the egg guardian and Baby Sidon from Hyrule Warriors: Age of Calamity.
