To unlock Co-op and Vs. modes you'll need to start with Adventure mode and get all the way through level 2-5. After this level, Co-op and Vs. will automatically be unlocked. On the main menu screen ...

Remember you can’t get sun at night, you need to be careful about the sun plants you choose to make sure you’re getting it produced quickly enough. After level 2-5 you unlock The Suburban Almanac that ...