Sure, for the 17th level wait until the kougra get over as far as he can go to the right. Then while all three of those pets are going back and forth in that tiny gap, jump the shoyru down and over the green spikes to hit the red button, and then back over the green spikes. Once you jump him over the second red button (don't let him hit this one), push one of the kacheeks until they knock that block out and all of them go to the door.

For the 18th level, make sure the first thing you do is let the purple mynci climb to hit the blue button. Then use the green scorchio to blow out the block on the left. Let the green mynci climb and the red scorchio blast out the block on the right. Then the green mynci should climb again to hit the red button. After that button is hit either of the scorchio's can blow out that block and they will all go to the door.

The 19th level should be pretty easy, if not neomail me and I'll help you with it.

For the 20th level, let the kougra dig down and once both him and the scorchio are down let the scorchio blast the blocks on the left, you only have to press his button once because on this level he'll continue to blast the rest of the blocks in his way. Then let the mynci climb the first then the second wall. When he gets to the button, let the kacheek push the block on the left and get the coin. Then they should all go to the door and you're done!

You can also get "Time Bonus's"