Leaky Boats
Leaky Boats is a challenge in Gridlock Canal. It is unlocked by plugging all six leaks, which can be done with crates (wooden or metal ones) or Luggage trunks.

The best way to do it is with Luggage Trunks, though. Every time you see a leak, there will be a Luggage nearby. This way is better because you might need to use the crates for other purposes, such as crossing the water or pressing switches. You also can't (accidentally or on purpose) push the Luggages into the water, so you don't need to worry about having to reset the level.

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