Paper Challeran A point-based puzzle contest available worldwide. Encourages arithmetic and strategy skills. http://www5.ocn.ne.jp/~pachalle/pachalleEnglishpage.html Ocn.ne.jp~Site InfoWhoisTrace RouteRBL Check
MATHmodels An online team competition where students compete to solve real-life problems using mathematical modeling. http://www.mathmodels.org/ Mathmodels.org~Site InfoWhoisTrace RouteRBL Check
Mathematical Contest in Modeling (COMAP) Annual online competition for teams of undergraduates to use mathematical modeling to solve real world problems. Includes information about registration and an archive of past contest questions. http://www.comap.com/undergraduate/contests/mcm/ Comap.com~Site InfoWhoisTrace RouteRBL Check