Hi GraphicsKat,
See attached pic as to what boulders to use when getting rid of the 3 yellow chompers.
This leaves you the 2 boulders on the right.
You cannot escape the red chomper so entice him to chase you and then roll the lower boulder marked with the X to kill him
Now repeat the procedure with Loof enticing the yellow chomper out and kill him by pushing the boulder marked with the yellow Y at him.
Hope this helps,
Malcdelsol
