AgentSheets was the first modern block-based programming language for kids. The idea of AgentSheets was to overcome syntactic challenges found in common text-based programming languages by using drag and drop mechanisms conceptualizing commands such as conditions and actions as editable blocks that could be composed into programs. AgentSheets is used to create media-rich projects such as games and interactive simulations. The main building blocks of AgentSheets are agents which are interactive objects programmed through rules. Using conditions agents can sense the user input including mouse, keyboard and in some versions even speech recognition and web page content. Using actions agents can move, produce sounds, open web pages, and compute formulae.