Adventure Mode

Adventure Mode, the only mode available from the start of the game, is basic levels one after another, with a new seed packet of item obtained at the end of each level. There are five groups of levels, which are Day, Night, Pool, Fog, and Roof, each with their own differences. Once in every area, there will be a Crazy Dave level with a gameplay twist, and the last level in each area will be a conveyor belt level. (Every Crazy Dave level except for Level 5-5 is later unlocked as a Mini-game or Puzzle Mode level.) During an early Pool level, the Mini-game mode will be unlocked, and Puzzle Mode will be unlocked during level 4-6. Once Adventure Mode has been beaten once, the Silver Sunflower Trophy is obtained, more Mini-games and Puzzle levels are unlocked, and Survival Mode is unlocked. When replaying adventure mode, Crazy Dave will choose 3 seed packets every level which have to be included in your seed slots, Crazy Dave levels will be replaced with their corresponding Mini-game or Puzzle Mode counterpart (if any), and a sack containing $250 dollars will be dropped by the final zombie each level instead of a seed packet, item, or note. You start out with only Peashooters, the basic type of plant, available.

Basic Area overview
Levels 1 - 3: seed packet obtained at end of levels

Level 4: item obtained at end of level

Level 5: Crazy Dave level, seed packet obtained at end of level

Levels 6 - 8: seed packet obtained at end of levels

Level 9: note obtained at end of level

Level 10: conveyor belt level, seed packet obtained at end of level