Knytt Underground

Knytt Underground is an adventure-platform video game developed by Green Hill Games and Nifflas' Games and published by Ripstone for the PlayStation 3 and PlayStation Vita. It is the second sequel to Nifflas' previous game Knytt. The game offers two playable characters, nonlinear gameplay, multiple endings, and a large number of side-quests and secrets.

Knytt Underground is a side-scrolling open action-adventure, with the exploration of a metroidvania. Its gameplay fuses the mechanics of Nifflas' earlier games. From Knytt it borrows the freedom to climb vertical walls as well as being able to safely fall from any height (barring hazards like lava and acid, but unlike Knytt water is not hazardous). From Within a Deep Forest it incorporates the ability to transform into a bouncing ball. However, there is only one ball "material" and different abilities must be gained by flowers that bestow temporary power-ups which are only usable in Sprite form, a new feature introduced in Underground.