Fig. 2
From: The incubation effect among students playing an educational game for physics

An example of the gold and silver badges as award for solving the level. (a) A gold badge was awarded. (b) A silver badge was awarded
From: The incubation effect among students playing an educational game for physics
An example of the gold and silver badges as award for solving the level. (a) A gold badge was awarded. (b) A silver badge was awarded