The digital era's technological transformation has a wide range of beneficial effects on the science learning process. Game-based learning (GBL) is the use of game design ideas to learn about some topic while pupils are striving to do their best in the process. This study was carried out with the help of Educaplay apps ("Identify Me Froggy" and "Do You Know Who I Am"), an online programme that allows teachers to develop free educational games. This survey research discussed the use of Educaplay apps to increase Year 4 pupils' understanding and interest towards Topic Properties of Light. The respondents consist of 25 Year 4 pupils from a primary school in the Malacca district. Data was collected through a pre-test, post-test, and questionnaire. The results of the t-test indicated that the mean for the post-test (Mean = 22.40, SD = 3.23) was significantly greater than the mean for the pretest (Mean = 14.20, SD = 5.25). The p-value obtained was >0.001 indicating that there was a significant difference in pupils' understanding after using Educaplay apps. The results of the questionnaire also show that Educaplay apps do improve pupils' understanding and interest in Topic Properties of Light. Thus, the collaboration of the Malaysia Education Ministry, State Education Department, District Education Office, and school is important for Educaplay apps to be implemented smoothly.