Sift Heads World Act 2 - The Treacherous Return, This new Sift Heads act has even more interactivity such as new weapons, new costumes, a new location to explore and new bonus achievements. You will also find the same great functions that were in Act 1 such as character selection, custom costume, weapon selection, varied game play and non-linear exploration. The game is complete with classic Sift Heads missions, interactive animated sequences, search and scout missions and more!