Big Heart
A Big Heart is an item found in Dance Dance Revolution: Mario Mix and Yoshi Topsy-Turvy.
In Dance Dance Revolution: Mario Mix, as the name implies, the item resembles a large heart in container. It can be bought at any shop run by a Lakitu in the Story Mode of the game. Mario or Luigi can purchase one for 170 coins. Up to three Big Hearts can be carried at a time. If Mario or Luigi had one in their possession and used it before a dance, the dance meter would completely fill up once it was empty. Even if the Big Heart wasn't necessary, it would still be gone from the item inventory. If they didn't use it, they would keep the Big Heart in their possession.
In Yoshi Topsy-Turvy, Big Hearts are more rare than normal Hearts. If Yoshi eats one, it completely restores Yoshi's Health Meter.