level 1: up (1)
level 2: up, down (2)
level 3: right, up, left (3)
level 4: right, left, up, right, down, up, left, down, right (9)
level 5: right, down, right, up, left, up, up, right, up, left, left, up, left, down (14)
level 6: down, right, left, up (4)
level 7: up, right, up, left, right, down, right, down, left, down, down (11)
level 8: right, down, left, up, up, left, right, up, left, left, up, right, up, left, left, down, down, up, up, up (20)
level 9: right, left, down, right, up, down, left (7)
level 10: up, left, down, left, down, right, left, up, right, down, left, left, right, up, left, down, left, down, right (19)
level 11: right, up, right, left, down (5)
level 12: up, right, down, right, up, left, down, left, right, up, left, up, right, down, right, up, left, down, right, up, right, down, left, up, right, up, left, down, left, up, right, down, left, up, right, right, down (37)
level 13: left, up, right, down, left, up, left, left, down, right, down, left, up, left, up, right, down, up, right, down, right (21)
level 14: right, up, left, up, down, right, up, right, down, right, right, right, right, up, right, up, right, down, down, down, down, down, down, left, left, down, left, up, down, left, down, right, down, right, up, right, right, left, right (39)
level 15: right, right, up, down, left, left, down, down, up, right, down, left, up, up, left, up, left, down, right, down (20)