Highland 1) Nice intro level. Not too hard, just stopping the hopper is annoying.
Highland 2) This needs major precision to time that the ball lands on the bridge, but not too far behind the builder.
Highland 3) Very easy.
Highland 4) Excellent level!
Highland 5) This is another level needing lots of precision. First of all one has to time the first ball so that it hits between the second-last and last lemming (assignment roughly at 2:54 on the clock). Then one has to place the mortar correctly. And then the big roadblock: Assigning the hopper, so that the falling climber grabs the lower edge of the blocks. This resets the fall distance, so that he survives the long fall.
Highland 6) Nice level idea, but unfortunately I have huge difficulties blowing the twister straight diagonally.
Highland 7) Excellent idea, stopping the second rock climber with the ball thrower. Unfortunately one has to turn the first two lemmings into climbers, which gives only a small space between them. Then one has to use the attractor as a ball-thrower, which makes it very hard on the timing to get the first rope done over the water. And once one has managed all of that, one has to blow the twister correctly.
Please consider giving one ball-thrower more, so that one has one extra to release the attractor. This would solve all the problems, except the last one.
Highland 8) Here is my solution idea: First use the twister to remove lots of terrain from the gray building, to reduce the height at which one can throw balls. Then find the correct position to throw the balls, so that they land on the deeper red block. Now climb to the left and twist to the gap in the steel wall. Hop over the red blocks and the balls in the middle. Then throw from the right edge one ball to the steel wall to reduce the fall distance. Finally release the crowd with the third twister.
Unfortunately the first two tasks require so much precision, that I will never ever do that. Sorry.
Circus 8) 100% certain, that this is just another backroute.
Circus 9) Amazing level!
Circus 10) Excellent level and a very nice way to save the climber!