The S4 project was a research collaboration with Sokikom, a math game company, funded by the Institute of Education Sciences. Dr. Chao and Sokikom created a series of games where students dragged and dropped virtual manipulatives to solve equal sharing fractions problems. Students could hear the problem in multiple languages and get hints. And teachers could see the validity of students strategies in real time. Sadly, Sokikom ceased operations and these games were never released.