Introduced in Toolbox, blades are one of the obstacle that makes up the Cut the Rope original gameplay. Although considered not a particularly hard obstacle, blades can become increasingly frustrating when the player tries to get three stars on a level. Blades come in three forms: single, paired and colour-coded, with singular being the least common and paired the most. Blades also tend to have a single arrow in the centre pointing in which direction the blade will rotate in.