You are playing on a laggy keyboard and mouse. The mouse is too slow. Use the keyboard shortcuts (if the build supports them—usually Space to pause, +/- to speed).
School and workplace firewalls are notoriously strict. They often block popular gaming sites and app stores downloads to ensure productivity (or at least try to). plague inc unblocked games 66 best
host the game using flash or HTML5, making it lightweight for most browsers. Strategic Depth : Unlike many simple "unblocked" titles, Plague Inc. You are playing on a laggy keyboard and mouse