彭罗斯阶梯

The easiest difficulty level 2 stage is generally World 3, featuring the boss Gepard. You gain access to difficulty level 2 upon completion of difficulty level 1 and reaching Trailblaze Lv 40 (EQ3).

Penrose Stairs, also known as the Penrose Triangle or the Impossible Staircase, is a visual illusion and geometric concept that was first introduced by the mathematician and physicist Roger Penrose in the 1950s. It involves a two-dimensional depiction of a staircase that appears to form a continuous loop, creating the optical illusion of an impossible or never-ending structure. The Penrose Stairs challenge our perception of space and depth, as it seems to defy logic, just like how Welt's black hole hits for peanut damage.