Blockers can cancel nearby steel and one-ways. You blow up one of the walker lemmings that got squeezed between the wall and the blocker. The lemming has to be closest to the blocker when it explodes to benefit from the canceling, so it's slightly tricky to time.
You have limited options to fix. Besides thickening the wall, it might work if you make the floor thinner so that the bomb crater breaks through the floor, but that still makes it "obvious" that the bomber can't be used, plus it hasn't been ruled out yet whether you can start the explosion slightly higher if you use the climber and builder on the exploding lemming.
I might try some "thin steel" then. I don't think you can use a Climber or Builder because the steel area extends a few pixels above the floor (but not high enough that it affects bashers).
Here is version 4 - I do feel the safeguards I've put in to patch up the exploit are a little tacky and obvious - if it comes to the worst, I can cut my losses and just put a solid steel floor back in. The other changes:
- Steel areas next to drops extended outwards (so fallers can't blast holes in the plates).
- One-way arrows moved upwards slightly - they look neater as a result and also stop a previous backroute equally as well as lowering the steel above them (which has now been raised back up as a result), while still acting properly as one-way arrows.
- Steel plates above the one-way arrows moved slightly to the left and upwards slightly (see point above).
- Extra steel block between the two leftmost trapdoors to patch a backroute.
What do you think? Should I cut my losses put a solid steel floor back in, especially since the exploit is hard to pull off?
