* We need to update a mission, like update the star count. */

* Returns the last element, or throws [NoSuchElementException] if this deque is empty. */

* Note that this has potential risk that when two `play()` calls are too close, * there might be only one */

* Configure the animation for a sprite, based on the latest item usage state. * For example, if a key is not used, the sprite should be a "closed che

* Returns the first element, or throws [NoSuchElementException] if this deque is empty. */

* The canvas' top-left corner pixel coordinate in the whole game map, and the pixel size */