OSN SD is a free educational game application developed by Kemendikbudristek for Android users. This program is intended for students who participate in the Center of National Achievement's OSN program. The app is designed to provide an online learning platform for students to continue their studies from home.

The program offers a variety of educational games that cover various subjects such as mathematics, science, social studies, and Indonesian language. The games are interactive, engaging, and designed to help students understand the concepts better. With the app, students can keep up with their studies, improve their skills, and prepare for the OSN competition.

Overall, OSN SD is an excellent online learning platform for students who participate in the OSN program. The program is free, easy to use, and provides a fun and interactive way for students to learn from home.