int width; /* playfield width */
int height; /* playfield height */
+ int left; /* playfield left edge */
+ int top; /* playfield top edge */
+ int right; /* playfield right edge */
+ int bottom; /* playfield bottom edge */
+
int time_seconds; /* available time (seconds) */
int time_initial; /* available time (initial) */
int time; /* time remaining (runtime) */