Re: New player - a few questions
Time to answer all 3 questions with total honesty.
1) There are 40 plant missions and 40 zombie missions. Each mission has 5 levels. So, there are 400 levels total, 200 for each side. Notes: Once you get to the final level of the final mission of either side, you actually can't complete it. You can win it, but you can't progress, and all you can do is play the last level of either side over and over again. Another note is that you cannot replay old missions you've already completed.
As for when things get real nasty, I'd say at mission 20 for both sides. I am currently stuck on Mission 20 on the zombie side, "A Shadow Falls", where the gimmick is that whenever a plant is played, it automatically gets +1/1 for free. Mission 20 for the plant side is easier for me, but the boss is still pretty hard.
2) You automatically open all 23 packs at once. As a new player, you should save up and buy 2 2,000 gem packs, as they are the best deal in my opinion. After that, save for 2 1,000 gem packs, then stick with getting a single premium pack whenever you get 100 gems. This is because gems are harder to get later in the game.
3) There are 7 types of challenges that should be available to get always:
1. "Win a multiplayer game."
2. "Win a match with X hero."
3. "Win a match with a X-Classed hero."
4. "Defeat X plants/zombies."
5. "Play 5 Beans/Peas/Dancers/Ect."
6. "Do X damage to heroes."
7. "Play X plants/zombies that cost X Sun/Brainz or more/less." (The hardest in my opinion)
Then there's a MEGA-QUEST you get every 2 weeks that gives you 100 gems when completed that says: "Do 300 damage to heroes."
Hope this helps. I'll answer ANY other questions you may have.