4-5 The Long and Winding Road. 100%
nothing much to it. Just remember to build back left out of the pools to give a lot of room for the group to walk around and get your hero in back of them so he can bash to make a wall in the area where the pit is so nobody dies. Also watch out for the area where you build up to the left if the lemmings don't fall on the water they can die, as it's high.
5-7 Wandering Free 13/20
*bomb reset
It’s practically impossible to not lose a lot on this level, as you have to start by building over water then there’s a high fall, in addition the RR can’t be changed. I tried building to trap them in the beginning area but later, when you need to free them you don't have enough skills to do so
and trap them, as you need to trap them in order to make it through the next area.
The way I accomplished it; Make ‘the lemming’ a climber and build over the first pool. You lose 3. Then dig in the block with the downward arrows that do nothing, you will lose quite a bit more here. This will trap the rest lemmings in a small space which is what you want. Build to stop him. When he comes back facing right let him climb out of the hole and dig down at the edge of this block so you can build to the ledge and make contact with it. When that is done, let him go all the way back to the beginning then mine right to the hole where they are all congregated then bash right to the steps. The idea is to give the group the largest area to walk around and waste time in. When he gets done bashing and the group is freed and far away, go ahead and bash through the next obstacle and build over the next pool. Dig through the next three platforms. Bash through the next on the bottom. The group should be almost caught up to you by now. When he gets done, make him a blocker right near the edge of the next pool. Once the crowd turns around reset him and build over the pool then bash through the last obstacle.
6-1 The Iron Curtain 100%
6-2 Make Mine a Large One. 28/30
If anybody wants an explanation on these just let me know.
EDIT:
5-5 One Way Ticket 49/50
Again, you can avoid lemmings falling to their death by digging and compacting them and spacing your worker far away.
note: ccexplore’s method of having one go through the steel to the balloon to bash through the thin part you normally bomb through won’t work because there’s no way to get him back down to the other area (that I know of). So you’ll have to kamikaze your hero at the end.
(It might be possible to force-bash through that steel to get inside there from the top but I don’t think you have enough bashers) edit: I have also never checked if the one-way-wall on the top actually works (it could be fake!)
6-4 Escape to victory is theoretically possible by using the miner/building position glitch, twice. *see this thread for explanation
http://www.lemmingsforums.com/index.php?topic=585.msg12387#msg12387Build up to the platform then make a hole for the others to fall into. Then make another hole for the weasels over the water. Get him to come back around to the beginning area and mine/dig whatever to the exit. Simple but pulling off that glitch is really tricky.