Divide and Conquer
From the Super Mario Wiki
Divide and Conquer is a microgame found in the Ninja Scribble stage in WarioWare: Touched! Its name comes from "divide and conquer", an expression which means to split a task into manageable portions.
The objective of the game is to divide the object by holding the stylus on screen and slice the object into two pieces from bottom to top.
Names in other languages