Quizoid is a free trivia game that is fun, educational, and challenging. The game has a simple, intuitive interface that allows you to easily navigate through the different categories and subcategories. You can choose to play in one of three different modes: Classic, Arcade, or 20 Questions. In the Classic mode, you will be presented with a series of questions. You must select the correct answer to move on to the next question. The other two modes allow you to play with a time limit. If you run out of time, you will be forced to stop the game.

The game's interface is minimalistic and straightforward. It allows you to navigate through the different categories and subcategories easily.