Maybe it was level 5. Anyways, tried again, got to Level 38 Factors of 39, there were no zeros and no 39s on the board. Could use a score system (maybe by time with real timer [not act counter]) and deductions for wrong clicks, and then a game over screen after level 38. Also make sure there is always at least one factor per level.

511! :) Could'a done better. OO, I cheated! :( @kuiske, see my first post? it says 'a point for each 10 act cycles survived'. How did I score so well, you might ask? I did not start the scenario right away (worked on a very hard sudoku puzzle -- not done yet). Anyways, using the system clock to score with is not a good thing. The game can be initialized, but not started (or paused) and the clock keeps going!