#define MAX_LEV_FIELDX MAX_PLAYFIELD_WIDTH
#define MAX_LEV_FIELDY MAX_PLAYFIELD_HEIGHT
+#define MIN_SCROLL_DELAY 0
+#define STD_SCROLL_DELAY 3
+#define MAX_SCROLL_DELAY 9
+
#define SCREENX(a) ((a) - scroll_x)
#define SCREENY(a) ((a) - scroll_y)
#define LEVELX(a) ((a) + scroll_x)