In Defend Against Cats, each level represents a desperate work day before a looming deadline. Waves of mischievous cats sneak in, scratch your monitor, knock your mouse around, and sprawl across your keyboard, steadily destroying your productivity. To stop them, you place food bowls, feeders, and toy-based defenses around your room. Hungry cats can be fed and sent away, while satisfied cats must be distracted with toys before they start tearing your setup apart. Different cats behave differently, with faster, greedier, and larger cats appearing as the invasion escalates day by day.