About Plants vs Zombies
The listing for Plants vs Zombies credits Anonymous, classifies it as Tower Defense, and identifies Scratch as the technology; the release field is Unknown.
Controls and Getting Started
The catalog does not provide confirmed inputs for Plants vs Zombies. For this Scratch version credited to Anonymous, on-screen prompts are safer than guessing a keyboard layout.
Gameplay Notes
For Plants vs Zombies, improvement should come from the behavior of this specific browser build: identify repeatable patterns, avoid changing several things at once, and compare the result on the next attempt.