Each of the designers had a somewhat different style in their levels: Dailly's levels often had titles containing clues to what to do (such as "It's Hero Time", suggesting that one lemming had to be separated from the crowd) and generally required the player to perform several actions at once; Gary Timmons's levels were minimalistic, with popular culture references in the titles, and Scott Johnston's (whose mother was the first voice of the lemmings) levels were generally tightly packed. Dailly was also responsible for the "custom" levels based on other Psygnosis and Reflections Interactive Amiga games, including "Shadow of the Beast", "Menace", "Awesome" and "Shadow of the Beast II". These "crossover" levels also used music from those games, though in ports these levels have been removed or altered to remove such references. After they developed most of the hard levels, they then created several simple levels either by copying the existing ones or creating new layouts; as Dailly states, "This I believe is where many games fall down today, they do not spend the time making a good learning curve." Timmons is credited with the official drawings of the lemmings, as necessitated by the need of Psygnosis for box cover artwork.