I'm not having much luck with 100% on Crazy 8, so please at least give me one clue: is it possible to cross the "tentacles" water object with only two bridges or not?
It is not possible to cross the water with two bridges, but it is possible to get up high enough to bash through the green stacks and reach the exit with only two bridges. I'll tell you where the bridges go:
1: Used with a digger to act as a "one-way" blocker to keep the lemmings from going left of the entrance.
2-4: Used to get over the water.
5-6: Used to get up to the "branch" on the green stacks to the left of the exit.
7: Used to stop the last basher. He turns around, but it is possible to turn him back toward the exit without a builder.
The solution is very similar to the screenshot on "Lemmings Solution" with a couple of changes.
Good job to "Guest" for the better solutions on Crazy 19, Wild 5, and Wicked 20. I wish I could try them out now, but I am on vacation, so I can't play Lemmings until I get home.