Here is Pioneer Puzzle #2. What do you think this is?
ANSWER to Pioneer Puzzle #1:
The bucket is filled about 2/3 full with water.
A piece of cheese is placed on the nail in the middle of the spindle platform.
The mouse sees the cheese and runs up the plank.
It jumps onto the spindle which turns and plunges the mouse into the bucket for its first and last swimming lesson!