Brain Quest: Grades 5 & 6 (Nintendo DS, 2008) Cart Only UNTESTED. This educational game, published by Nintendo, is designed for children in grades 5 and 6. It features a combination of challenging questions and fun games that help kids develop their critical thinking skills. The game comes in a cart-only format and is compatible with Nintendo DS. Please note that this copy is untested, and we cannot guarantee its functionality. However, we offer a 30-day return policy if you encounter any issues with the game. This is a great opportunity to get a classic educational game for your child's Nintendo DS collection.