The canal lock activity needs to have an intro message telling about what to do in order to complete it. It is hard for anyone to figure out what are the areas to click and the procedure to follow in order to accomplish the task.
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Hi,
the aim is to let the child find how it works and discover the different steps in the order: qsTr("You are in charge of the canal lock. Open the gates and the locks in the right order, so Tux can travel through the gates in both directions.")
If you want to add instructions it should not be too easy so no pointing step by step but only telling what are the different clickable items.