"Infinite" Update

Now you can generate Infinite levels through the level generator.
The level generator can generate 6 levels and 3 levels of difficulty.
Just click ∞ in the buttons above to switch to the Infinite mode. The level selection button is no longer displayed in the Infinite mode. Instead, there are 3 difficulty choices. Each click will generate a new level of corresponding difficulty. You can restart the level by clicking the restart button, so you can restart any level.