Yakudoshi is ninja training for your brain! Attain maximum focus by practicing Yakudoshi daily. Do not let the beautiful scenery or mystic shakuhachi music sway you! You must clear your mind to unerringly beat the clock and win the hanafuda trophies! As you collect the cards, increase the challenge by unlocking tougher levels! Finish the appropriate yaku groups and to attain the mastery-achievements to prove to the world that you are the ultimate mind-ninja. (Sign up for OpenFeint to access achievements and leaderboards)