I have been playing for PVZGW 2 today even though it said it would be released tomorrow. Anyways the xp multiplier was difficult to complete especially the multiplayer challenges as there is very few players. The plants and zombies had missions to complete Once you complete the first few you will get a choice on what new plant or zombie agent you want to help first. (the missions are very similar). They were so easy the hardest ones were the garden or grave ops missions. The new garden ops has AI (bot player) so if you do not have 4 players you can still get the same experience. There are so many chest you need to unlock with stars and some secret chest but all chest always had a few coins. Competing all the agent missions unlock a chest with lots of coins and a customization. The unicorn chomper has 175 lives and takes 25 damage with each bite and sorry you cannot put the teleport abilities on other chompers but you can also replace it with burrow. It takes very long to get the characters xp and I have been using 1 character most of the time. There are some optional missions such as collecting gnomes, collecting snow globes, and random characters with missions.
