Ahribar, you never did explain how to save 100% in Havoc 10 - Flow Control!
To get back to the main menu, press whatever key you designated for B on the control pad. Also, what some may not know if you're used to the DOS Lemmings, is that in the Megadrive/Genesis version you can select any previous level by pressing left and right in the title screen. So all you need are the codes to the last levels of all six ratings, and you have access to every level.
As for Present 9, crossing the gap at the top? What's the rest of the solution you used? I was able to save 100% by containing the crowd while one dude built.
Present 14 - Like an Overflowing Wave
Save: 50/50
Time: 5 minutes
Release rate: 99
Skills:
Builders: 5
Bashers: 5
Good: Interesting design and a nice use of a high release rate.
Bad: The design is perhaps too simple, and the long walkway is pretty pointless. And nobody would need five minutes to pass this level unless they forgot to pause it while they went to the toilet!