Since you only take into account of European parts of these countries (e.g. for Denmark you didn't consider Greenland), the highest point of the Netherlands should be 322m
Other than the Netherlands issue, Portugal is definitely up for debate. The Azores islands are usually "given" to Europe, unlike Madeira or the Canary islands, which are usually assigned to Africa. The highest point in the Azores would make Portugal qualify for the purposes of this quiz, unless there is some Jetpunk standard already specified regarding this issue.
In conclusion, it should either be accepted or specified in the notes that the Azores aren't being counted towards Europe for any reason.
Agree with pablogarand. Azores is not like Greenland or a Caribbean island. If Iceland count as Europe, Azores should as well. And the highest point of Portugal is 2351!
In conclusion, it should either be accepted or specified in the notes that the Azores aren't being counted towards Europe for any reason.