Shiken is a learning app that combines meditation and trivia games to enhance information retention. It offers over 50,000 study sets of quiz questions and flashcards created by experts. Users can challenge themselves or friends, earn points, and customize their study sessions. The app also provides detailed analytics on user's strengths and weaknesses, timed exams, and note-taking capabilities. Quiz types include single best answer, extended matching questions, true/false, ranking order, multi-select, text and audio answer, flashcards, and image hot spots. The Shiken Store offers both free and premium content across various topics, including Maths, Science, and Medicine. The app also features a mindfulness area with 3D ambient soundscapes, nature sounds, unguided timed meditation, breathing exercises, and a progress tracker. The premium version includes guided meditation for studying and confidence improvement. Users can store exam dates and deadlines, create countdowns, and color-code exams. They can also collect "study buddies" by answering questions correctly and unlock accessories for them. The premium version allows users to add photos and images to notes.