@Plodderuk You say all of Depressive is solvable and I believe you, but I just can't do Intruders in the Antarctic. I'm pretty sure I have the solution but it's always a single pixel shy of working! First, I bash to the left and immediately build a platform to the left wall. This loses 3 lemmings but the save requirement is 36 so that's OK. Then I send up two climbers to the left, making them gliders. Bomb the first glider to make a little ledge for the second glider to land on otherwise he misses the edge of the platform. Mine down to the right and hit the steel, go back up and make the glider a blocker. Meanwhile, the crowd builds up to the right but it's one pixel shy so requires two builders. Then the crowd should go up the miner tunnel and use the last builder to reach the exit, but because of where the miner started, there's a one pixel gap in the miner tunnel that the crowd walk through so can't ascend to the exit. If the position the miner could start from were a single pixel higher, it would work, but no matter where I bomb, I can't make that happen. Very frustrating! I'll be interested to see your replay. Maybe you came up with a completely different solution, but this looks like the obvious one to me.

NEO 2 is haaaard man I get the basic idea, but whatever I try, I always finish up a lemming short of the target. It's funny because there aren't really that many options, so it's clearly just some detail I'm not catching there. As I say though, I will come back to the pack at some point and try again

NEO 2 So Many Spikes : this one may be the toughest of the rank. Do know that at least first and last lemming have an important role

NEO 4 Tower Of Sacrifice : created by IchoTolot so blame him for the difficulty ! Once you made one Lemming a climber, you must notice that the music is "I Will Survive". So please make him survive at any cost. Really nice level design by Icho where things fall into place by themselves afterwards.

NEO 5 The 6'' Escape Plan : one of them Lemming has to Escape this very poor level design. Via thE uppEr or downEr routE is your choicE.

It was just a case of starting the second miner a bit further on to finish the bridge across the gap higher up and still be able to bash through to a survivable height.