In Troddlers, you play as Hokus alone in solo mode. In multiplayer modes, player 2 plays as Pokus. The game is broken up into missions. Before each mission, a screen telling the mission objective and a few facts about the level (such as the number of Troddlers) is shown. A player must complete whatever task is given to him within the time limit (usually a few minutes). There are three main objectives that appear in the game: the more common objective involves leading stray Troddlers to an exit, somewhat similar to the gameplay in Lemmings. Another objective commonly given is the destruction of zombie Troddlers. The third involves collecting gems. Many levels combine two of these objectives and sometimes all three. There are, naturally, many obstacles and enemies throughout the game.
Source: Wikipedia, "Troddlers", available under the CC-BY-SA License.