Plants vs. Zombies is a 2009 tower defense video game developed by PopCap Games. It was initially released for Windows and MacOS X, but has been ported to consoles, mobile devices, and handhelds, which includes a DS release.
In the game, the player must defend their house from zombies who want to eat their brain, by using an army of strange plants that will shoot and attack incoming zombies. The game also features several puzzle levels, where you either break open vases containing either zombies or plants, or a mode where YOU play as the zombies.
This is what berrimeow does, who completes all 18 puzzle levels in record time.