  Children are one of the groups most influenced by COVID-19-related social
distancing, and a lack of contact with peers can limit their opportunities to
develop social and collaborative skills. However, remote socialization and
collaboration as an alternative approach is still a great challenge for
children. This paper presents MR.Brick, a Mixed Reality (MR) educational game
system that helps children adapt to remote collaboration. A controlled
experimental study involving 24 children aged six to ten was conducted to
compare MR.Brick with the traditional video game by measuring their social and
collaborative skills and analyzing their multi-modal playing behaviours. The
results showed that MR.Brick was more conducive to children's remote
collaboration experience than the traditional video game. Given the lack of
training systems designed for children to collaborate remotely, this study may
inspire interaction design and educational research in related fields.
