You can spend five dollars in Plants vs. Zombies 2: It's About Time to advance from Ancient Egypt to the Pirate Seas. You can unlock enhancements with cash, or use your real money to purchase in-game currency, stocking up on power-ups and using them to blow through every level. Or just keep your money and enjoy an experience that's every bit as challenging and rewarding as the original.
Fans of the original flower defense game were understandably miffed when they discovered the official follow-up would be launching exclusively on iOS, but what really worried folks (myself included) was the "free-to-play" business. With so many free-to-play mobile games failing to achieve a comfortable ratio of playable content to payable content, it was only natural to imagine a game with limited play time and pay-per-planting.
Plants vs. Zombies 2 isn't like that at all. Rather than alienating fans of the original game by locking content behind pay walls or dumbing-down gameplay for more casual players, Plants Vs. Zombies 2 is only going after players who lack the patience or skill to make it through the game on their own.