It’s quite hidden, actually: https://www.cinemaxx.de/zeitkarten

€400 for a year (€33/month) and you have to pay it upfront.

I would probably go for it if I had to, but that’s close to my personal limit of what I’m willing to pay. Especially the whole prepaid aspect is a bit hard to swallow. (Since I have my UCI Unlimited Card now for more than a year I can cancel it monthly.)