×Start the room from the north entrance

×You need to spend much of the time standing still letting the tar expand till one group is trapped then position the next group.

×There are 17 roaches, and the largest enclosed area is 22 squares, the one in the top-right, so you should lure the roaches there first, since there will be enough space for all of them and the tar baby that will form later.

×I have indeed done this, but then the mother goes 'oh, hey, please enjoy some tar babies in the upper left hand corner that you can't go deal with or else you lose your setup in the upper right hand corner.'

×I can go 'oh, hey, lemme put everything in the upperright corner', and all the tar babies go in the right place, but I'm apparently too stupid with roach manipulation to get everything into the right area on the doors. This kind of deal isn't fun by any stretch of the imagination. >_>;

×I entered from the south, then ran up and stood and waited for the tar to trap the roaches in the bottomleft section. Then I went to the top right section and (guess what) waited. A tarbaby will form in the topleft section and I had to precisely get it trapped in tar to be able to lure it up to the open door. Then it´s easy. Just arrange the roches and babys in the upperright section and wait for the tar to cover everything. Then kill everything.