Open the settings menu (gear wheel) and select the option Difficulty. Select one of four difficulty levels: Beginner, Intermediate, Normal, Advanced or Expert.

With the Custom option you can also customize the game board to your liking. To adjust the board, drag the bars to the desired position or tap the individual numbers and enter the desired value with the keyboard. The maxium size of a custom board in Minesweeper.World is 99x99 with up to 999 mines.