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River Crossing is a puzzle in Professor Layton and the Last Specter.

Puzzle

US Version

You need to get one dog, two cats, and three baby chicks across a river. You can take two animals at a time.

If you leave the dog with only one cat, there will be a fight. The chicks on the riverbank must outnumber the cats. Otherwise, a fight will break out.

Can you ferry all of the animals across without them fighting?

UK Version

A man wants to take his dog, two cats and three chicks across a river using a raft.

Unfortunately, the raft is so small that he can only take two animals with him at a time. To make things difficult, he can't leave the dog with just one cat, and the chicks must always outnumber the cats when unattended.

Can you help him get all his animals across the river safely?

Hints




Click a Tab to reveal the Hint.

On the first trip, take two cats with you to the other side.

US Version

Keeping those tabs on the cats is the key.

After you take the cats on the first trip, take either the dog or the two chicks.

The animals won't fight if you're with them on the riverbank.

So, what do you do next?

UK Version

Keeping a close eye on the cats is key.

After you take the two cats across, you should then take either a dog and a chick, or two chicks.

Don't forget that the animals won't fight as long as you're with them.

US Version

Each time you have a chance, take the two cats back and forth across the river, rather than leaving them with other animals.

If they're on the raft or alone on the riverbank, the animals will never fight.

UK Version

Take the two cats with you back and forth across the river, rather than leaving them with other animals.

If the cats are on the raft or alone on a riverbank, the animals will never fight.

On your first crossing, take the two cats. You can safely leave them there.

Next, ferry the dog and one chick across the river. To prevent a fight, take the two cats back across the river with you.

Then take the two remaining chicks, leaving the two cats behind.

Finally, go back for the two cats!


Solution

Correct

Correct!

US Version

There are many different ways to get all of the animals across, though it can be done in only seven crossings. Feel free to find other ways to do it!

UK Version

There are a number of ways to get all the animals across, but the shortest require seven crossings.

Feel free to find other ways to do it!

LS005S

A big thanks to http://professorlayton4walkthrough.blogspot.com

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