Heard about this too. But it doesn't seem to work for me. Sometimes seemingly difficult Open Assignment games turn out to be more manageable once I flesh out some key inferences. And some Numbered ordering games seem easy at first, but end up taking up a lot of time, either because the constraints are more complicated, I missed some inferences, or the questions are complex.
I've given up on the "seek and skip the hard games" strategy. I think it's best (at least for me) to go through games sequentially, and perhaps skip (guesstimate) difficult questions within some games.
Good topic