Grassland is World 1 of the Theory series. It is easy like World 0, with a basic layout. It is a grassy plain infested with butterflies and birds. The first stage is based upon that. The second stage takes place at a field of Mad Cows. The third stage in the sequel takes place at a few grassy hills similar to the first stage. The fourth (or third in the original) takes place in the suburbs near the grassland, which contains a generator spawning a countless number of Evil Gnomes owned by the boss in the world, in which the heroes must destroy and defeat the Evil Gnomes spawning from it. The boss in this world in both games is Lauren Tiniathan, who kidnapped Skyla in the original and Plankton and Planktonine in the sequel.