In Worm Craft, you have to save a minimum number of works per level - the number differs as each level progresses. You are trying to save the Outlaw Worms that were exiled to an island in the Pacific Ocean. You'll have to learn what the action buttons mean in the lower left side of the screen. You can save them by turning them into mushrooms or capturing a small amount at a time before they fall into the ocean. You'll get a password between each level so you can easily come back and continue the game. Play until the end where you get a cheat code to use to defeat the game.