Finding Words on Main Diagonal

In Algelandia, the favorite pastime is the Word Search puzzles. One of these has the following characteristics:

1. The words occur only in the direction of the main diagonal;
2. Words can occur with uppercase and/or lowercase;
3. If a given word exists, it occurs only once and at any position on the diagonal;
4. Words can exist in both normal and inverted form, that is, the diagonal reading could be top-down or bottom-up form.

In this context, the figure below demonstrates how the words “workshop”, “videogame” and “scanner” can occur in the game.