On "Go out for a walk?" obviously the difficulty is finding the right places for the five diggers. I make it: (1) into the irregular shaped area at top right; (2) out of this area; (3) into the X-shaped area at bottom right; (4) at top-right of the middle X-shaped area; (5) at bottom-right of this area. Then climb, block and bomb the corner of the square block.
.....right?
I think I'ts possible with 4 diggers if you dig (1) a bit earlier and cut out number 2 in your solution. they sould survive the fall.
Pressing on:
Tricky 21: Don't leave any lemmings
Skills: 30 Blockers
A0; A0; A0; A0; A0;30 Bombers
A0; A0; A0; A0; A0;30 Builders
Save: 25/50 (50%)
Release rate: 01
Time: 9 mins
A0;
Good: You're forced to use Bombers to destroy bits of the terrain. It also looks cool
Bad: The title. Honestly, why have a title like that when you need to loose lemmings to finish the level.
P.S Ahribar, if you want to play these levels you could download Gens and the Megadrive lemmings rom.
You won't be able to use the mouse though.