A digging game involves any game where players are tunneling into the underground. This can be for a variety of reasons. Take Grindcraft for example, where players are digging out materials in order to craft structures to live in and armor to defend themselves with. While a lot of crafting takes place in this game, it all starts with digging out resources.
Some games have a more simple objective, such as Diggy. In this classic Coolmath game, players have to dig to the center of the Earth with a drill. Collect and sell ores along the way to upgrade the drill and get more power behind it. You will need a good strategy to beat this game quickly though – there are a lot of ways that you can waste time. Nobody said that digging to the center of the Earth would be easy, so try and use your resources wisely.