GitHub Pages: Many developers host HTML5 games on GitHub, which is rarely blocked because it is a tool for coding.
Physics-based games where you must launch ducks into baskets, or logic puzzles where you must clear a path for a duckling to reach its mother, are staples of sites like Cool Math Games and Unblocked 76. These games fly under the radar of strict IT administrators because they are often categorized as "educational" or "puzzle" content, making them a safe bet for a quick mental break. duck games unblocked