Cannot decide?
Random Monster Game
Every pick is a real entry from the game library, so this button can never land on a page that does not exist.
Why a random pick is a good idea
People gravitate to the category they are already good at, which is exactly the category with the least left to teach them. A random pick is the cheapest way to end up playing something you would not have chosen — and on a library this size, roughly five in six picks will be outside your usual corner.
If the pick is not to your taste, press the button again. If you would rather browse deliberately, the category pages explain what each kind of game actually asks of you, and the full library can be filtered by difficulty, gameplay type, monster type and environment.