Zombies 2 is still the instantly accessible, dumbed-down, yet strangely addictive version of a tower defense game that its predecessor was. You still collect little bits of sun energy to buy plants that automatically fire a t enemy zombies shambling in from the right side of the screen. Zombies (and if you haven't, why not?), the basic gameplay will be familiar to you here. Zombies 2 generally strikes the right balance between challenge and convenience, charging players only for things they can do for themselves quite readily. Zombies 2 would be a free-to-play game driven by microtransactions, many people were worried that the change would ruin the careful balance Popcap had struck with the first game.
