Unsiege Mentality is an achievement unlockable in the Nintendo DS version of Plants vs. Zombies. It requires the player to beat any Roof level without using lobbed-shot plants. This is the same requirement that the achievement Grounded has.
- For more strategies, see Grounded.
To get this achievement, play any Roof level, and do not use any lobbed-shot plants. Use peashooting plants (like Repeaters, Threepeaters, etc.) on the fourth column from the left or Fume-shrooms on any column, as its fumes can be shot over the slanted part and onto the flat part. Fume-shrooms sleep during the day, so make sure you wake up the Fume-shrooms with Coffee Beans.
- The Cabbage-pult in the icon does not have a cabbage in its basket. The basket is also a different color, appearing to be a gray-ish color.