Can anyone give some hints for solving Partiti-3? I was able to prove that the bottom left corner has a 2 under an 8, and the bottom right corner has a 3 under a 7 (i.e. those four boxes only have a single number in them). But past that I'm pretty stuck.
Since all the number appear in a cluster (11, 10, 9, 8 and 7) identify the possible combinations for these numbers so that can appear together in a 2X2 box of cells.