This map is identical to Map 25, but with one difference: A large piece of ghost ground is in the middle of the map, making it harder for the shaman to build a construction of planks, as well as using the Cannon Express method.
Map42 can't be done without the shaman's help.
The easiest and most common way to solve this map is to cannon mice over from the first to the second platform and back again. The ghosted wood won't affect the cannon in any way.
If you want to build a construction of wood nonetheless, never try to place any object directly into the ghosted wood, because this will make the placed object to switch position between outside and inside the wood and will cause a sure fail.
One way to solve it by building is to build stabilized planks until the ghosted pillar and then attach a small red-anchored solid (not ghosted!) plank (rotated 90°) to it. Jump onto it and do the same for the right end of the large ghosted pillar. Now jump from the first plank to the second and go on building. This solution is nonetheless kind of dangerous because some mice might fall into the gap between the red-anchored planks, which can't be blocked because of the ghosted wood.
- This map is replaced with the map of the same number.