The Roundtable is about Word Score, a serious game designed to increase the vocabulary of pupils in upper primary school in the Netherlands. Word Score was used during a national project called Educational Time Extension, in which class time is extended outside scho...ol hours with the aim of increasing learning results of under-performing pupils. The study showed that the use of Word Score can be used effectively during Educational Time Extension. The vocabulary of the pupils who played the game significantly increased. The experiences of both pupils and teachers were very positive. The pupils liked to play Word Score and the teachers were very enthusiastic about the game and the results of the pupils.