It is still beatable, and will be in 2.0. The strategy has changed slightly from previous versions, though.

Apologies in advance if the tips aren't all that helpful; apart from the first one or two, all of them give, at best, vague directions to explore, since we don't want to spoil the puzzle element. In the case of this one, the trick is getting the three rats in the right configuration.

In one of the last three updates, one extra turn is required to finish the job.