The shapes test I thought was ok. The key in that test is to look for an easily identifiable corner or edge. For example, if the shape you're looking for looks like this.. (Ignore full stops, these were needed to keep the formatting)
......l.\..........
......l..\.........
......l ..\........
____l... \.......
l.......... /......
l ......../........
l_____/.........
..identify a feature such as...
......l.........
......l........
____l..........
Then look for this first. There may only be one or two points where a horizontal and vertical line intersect like this so it instantly makes it easier to find the full shape.
This seemed to work quite well for me!