Which gap in Havoc 8 needs 2 builders? Is it the big(-ish) one above the entrance? Does that mean builder bridges in Lemmini can't span as long a gap as Lemmix/DOS?
![Shocked :o](http://www.lemmingsforums.com/Smileys/lemmings/shocked.gif)
I don't have any experiences with Lemmini, but based on past experiences with levels from other platforms (eg. Genesis, Mac), I'd say that while occasionally there's the rare one or two level that plays out differently, so far none I knew of has actually crossed the line into outright impossibility. Typically the availability of extra skills and/or margins in save percentage keeps things possible. It also helps that most of the time the standard level solutions only make use of the most "basic" aspects of the skills' behaviors.
I'm also pretty sure that during development, the author did what is necessary to at least keep all 120 levels in original Lemmings to remain solvable in Lemmini. Less sure whether any attention was paid to ONML levels at the time though.
And while you are looking at this, you might want to include the Xmas levels as well?