It was EXTREMELY difficult but I managed it eventually haha. This does rely on a certain
amount of luck too.

I can't remember exactly but the plants I used were;

Tall ***, Lily Pad, Cattail, Magnet Shroom, Coffee Bean, Melonpult, Spikeweed and
spikerock, and garlic I think it was.

So what I did was at the back have a column of melonpults (for splash damage) none on lily
pads, so just 4. Then 6 Cattails, so three columns of them. Now in the 3rd column have two
magnet shrooms and wake them with coffee beans, I put them on the 2nd and 5th row. Then
4th row have a column of Tall nuts (even on the pool) then 5th row put down some
spikerock. Be ready to replace Tall Nuts as need be, you will start the onslaught with 250
sun, and will get another 250 every round. If you get lucky and the Tall Nuts survive for
a bit, get more magnet shrooms (on row 1 and 6).

This should get you close, if not, then a little bit of tweaking and you should get it! :)

I can't seem to edit that last post. Anyway I mentioned Garlic and didn't even use it.
Well I would replace it with any kind of cheap instant kill plant. Probably tangle kelp or
squash. Tangle kelp is good because the weakest point is actually the pool, as I just ran
through the level doing the above and I won, but only just and the pool almost got
obliterated. But a squash on a lily pad can be more effective against a group (and
jalapeno would be awesome if it werent so expensive)

Look, the best way, at least for me is to use repeaters, and fire logs, repeaters in the
first and second row, except in the water, and the third to put the logs in the case of
water, put in the first repeater and the second a log.
in the fourth row and put the magnets, do not forget to cafe, and the fifth only potatoes
with pumpkin, I hope you serve.
PD: sorry the bad english, i use a traslator in google, XD, sorry if y dont explain fine,
PD2: i hope dont have a bad mistake

of well, check this page, here i put how i pass the level
http://www.fotolog.com/josesalazar9125/39347626

ok to beat last stand you nead 4 cob connons and 8 cattails then just sit back until a big
group appers then blast it whith your cob cannon but beware cob cannons take some time to
reload thats why you need 4.

I just used a single column of gatling peas, torchwood right next to it, a blank space and
then tallnuts. Increasing to a second row of tallnuts as the sun became available and
adding a third row to the most damaged rows. Beat it no problem

just use gatling peas and put that fire tree in front of it. i also used those corn
because it stops the zombies for a while and really important to have magnet shrooms

Repeater, gatling pea, torchwood, lily pad, Tall-***, coffee bean, magnet-shroom, cherri
bomb, jalapeno, tangle kelp.

just use 2 columns of repeaters on LAND with a torchwood and infront of them is tallnuts.
while in the pool use 2 columns of cattails, 1 column of repeaters, 1 column of torchwood
and 1 column of tallnuts. that's all

2 gold magnets,22marigolds,4 gloom shrooms,2magnet shrooms,4 garlics and 4 tallnuts