I think this is the true limit with the upgrades avaliable Stage 15. At first I didnt even know i could use the mouse to do the gravity thing (classic commuity playtesters not even reading the instructions) But after level 12 it became the only way to progress. I enjoyed it alot more once it was no longer an idle game. aside from there being no "life lost" or "punishment" for letting the blocks get to the centre I found it a satisfying cursor dexterity challenge.