User blog comment:Big plants fan/My new achievements./@comment-5073889-20120728122028/@comment-26531060-20120728131003

Totally impossible, too many zombies. If you use 9 columns by 6 rows of them, there will be 9x6=54 of Potato Mines and Tangle Kelps in total. But one of them is 25 sun, so total will be 54x25=1350, but since you only get 1000 more sun in Last Stand, you still need 350 more sun, so it's technically impossible, unless through hacking. Learn some math and logic, dude!