Thanks for the code.

I also tried this:

if (this.pos.x == 49) {this.move(LEFT);}
if (this.pos.x == 0 ) {this.move(RIGHT);}
if (this.pos.y == 49) {this.move(TOP);}
if (this.pos.y == 0 ) {this.move(BOTTOM);}

And it also seems to work.

My problem was made worse when I skipped all creeps with fatigue > 0. But creeps with 0 < fatigue < 1 seem to be able to move so now I only skip creeps with fatigue >=1.

My creeps blink between rooms at random when trying to enter a room.

Do any of you have a great code snippet that makes a creep enter a room efficiently?

Thanks.