Finished now at 2560. 2528 seemed impossible without a booster.

No.

Does anyone know : what

Does anyone know how many levels there are at the moment? I am at 2070 now.

I do notice, though, that the first two or three attempts at passing a level are FAR more easy than the next attempts. After the first two or three attempts, it sometimes seems impossible to pass the level. Only after 40 or so attempts, the possibility of passing the level returns. I do not know if this is really the case, but I have noticed it quit a lot. Especially the first attempt seems much more easy. I just passed 2059 in one attempt - which is supposed to be difficult.

I am at 2060. Can't remember having troubles passing 2038.