Binary patches modify the machine code of an application. If the patch is applied incorrectly or if the cracker miscalculated the file offset, the application may crash, corrupt save data, or cause system-wide instability.

Sudoku is a puzzle game that consists of a 9x9 grid divided into nine 3x3 sub-grids or "regions." Some numbers are already filled in, while others are blank. The objective of the game is to fill in all the blank cells with numbers from 1 to 9, such that each row, column, and region contains each number exactly once.

: Keygens are algorithmically generated keys that can activate software. They are often created by reverse-engineering the software's registration process. However, creating or distributing keygens is illegal.