Each task hangs on the rope as a tile until it's done. Click a tile to finish it; it shatters. Urgent tasks are platinum, overdue ones turn red. The first eight hang on the rope.

Settings → Tasks.
Settings → Tasks.

Free has 3 tasks; Pro has unlimited tasks with due times, reminders, repeats and urgent tasks.

Screenshots are from Windows and Linux. The Mac app has the same settings in its own Settings window.