Unless playing I, Zombie levels, the readme.html of the game is correct and accurate, where it states that if the player lets a zombie reach the house or drop down the chimney in Roof and Night Roof levels, they will lose the level. It will stop giving tips after it is grown it to 1000 feet (after 50 feet, it will only give 'milestone tips', after being grown to 100, 5 feet).

There is no doubt that this was put in as a joke as the player gets some help when first playing the game (as well as a digital manual that comes with computer versions of the game, readme.html, and an instruction booklet with the Nintendo DS version), and as it says it was made by the zombies. For some versions, instead of an in-game help section, PopCap Games decided to put in a unique feature, the Tree of Wisdom, that gives the player tips on playing the game the higher it is grown. Zombies FREE, the Help can be accessed through Help & Options → About → Help, and leads to the EA help website instead. However, this note is not in the PS3/Xbox360/PSVita version, as it is replaced by an actual help menu (although it is on a piece of paper that looks like a note from the zombies). this help section brought to you by the Zombies You win the game when the Zombies get to your houze.

When the Zombies show up, just sit there and don't do anything.

Plants vs zombies sunflower tits