DuckMath is an unblocked games site dressed as a math resource. The math-sounding name and URL are deliberate camouflage: a keyword filter scanning for "games" sees "duckmath" and lets it through. Behind the name is a fairly standard portal of browser games, many of them loaded from third-party sources.
Credit where due — DuckMath is reasonably popular and its catalog is broader than a single-game page. The disguise works often enough that students share it widely. The question is not whether it works today; it is how durable that approach is.
