You're wrong.
In Norway, the standard system is that you get into a private voting booth, which is stocked with ballots for different parties. You may if you wish rearrange this ballot (cross out candidates etc. using a normal pen), before you put the ballot in a closed envelope. You take this envelope, together with an ID, to the ballot box, show the ID and get crossed off the list, and put the envelope in the ballot box.
It is also possible to cast the vote a few weeks earlier at some locations (local government offices, universities, embassies/consulates etc.), basically using the same system except that the protocol (the list which you are crossed off from) is electronic.
Finally it is possible to mail in a ballot (you need not use the official forms, it is acceptable to write the name of your favourite party on a sheet of paper) if you are living abroad, but the process is somewhat complicated. This probably corresponds closest to the electronic system.