In this stand-alone add-on to Collapse, the events start out directly after the end of the original game. These additional four chapters describe the return of Rodan to "The Hole".
The add-on comes with many features that improves the replayability of the story mode such as achievements (50 items), arena (4 maps), trials (certain goals to reach uncovered with the story progress) and ab experience/rank/upgrades system. The latter means that by using certain weapons (sword, in particular) will give experience to the protagonist. Each level of experience gives additional points which the player may assign to his sword fighting styles to upgrade them.