×Please help me with the positioning of the decoys as the queen I'm trying to lure goes anywhere but where I want. I really must have tried every square on the grid and have jiggled with timings but to no avail.

×top right corner by the staircase and green door

×top left above force arrows to prevent migration up there.

×as queen moves right, she gets caught in a 'dunno which direction to go in' loop so I nudge her with one in the main left arena

×as she moves past the right force arrows nearing the trap i place one above her and get get her within one square of the trap but my final placement veers her up to the inaccessible area. I've had single roaches activate the orb but queenie always ends up at the forbidden zone.

×First decoy under green door as far left as possible. Crack hidden corner and put Beethro there. Queenie moves right.

×As she moves right, I nudge her with a decoy placed on the same line as first one and avoiding all roach spawns. She moves in a straight line

×No matter what I try, I can't get her to move diagonally into the trap once she's in the right most quadrant!

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Drive the queen up into the upper left hand corner with the first decoy. Position the decoy so that the top of its field of effect is on a level with the mouth of the 'tunnel' you need to get a monster into. Place the remaining decoys on the same level, forming, essentially, a wall of decoyness going across the room. Make the edge of the last decoy stop short of the mouth of the 'tunnel'.

Stand so you're right under the place where you need the creature.

Wait. Wait a long time. As the queen spawns, the Decoy space will fill up and roaches will move along the top. Eventually all the decoy space will fill and you'll have, essentially, a wall of roaches that more roaches can walk across to get into the tunnel.

Ugly, but effective.

Of course, then you have to kill about a million roaches. I think I saved a decoy to take out the queen at this point. Just, y'know, for optimization purposes.