i think it depends on how many toons you got around the pond, id say one toon can do the corners, a straight line and even the diagonals, but i havnt been sucessful by myself on any of the others.
two toons can do them all apart from the blockout, but the three way is still quite tough.
with 4 toons they are all easy apart from the blockout, which really is tough cos of the time limit.