Solar Saver

Difficulty: Medium

Solar Saver is an achievement in Plants vs. Zombies Adventures. It is earned by winning any level with at least 500 sun remaining.

Strategy
There isn't much. Just collect sun combined from the sky and your Sunflowers. It isn't entirely hard, but the problem is keeping the 500 sun, as even when your defenses are fully set, you'll probably end up wasting some sun on freezing zombies or in Instant Kills.