As fast as you can after clicking "Fortsätt", right-click and press "Play/Spela upp". This will start the game faster as you won't have to wait for the arrow to appear.

Walk left to the blue house and position yourself in front of the fence, just to the right of the blue paint.

Right-click and press "Forward/Framåt" then "Back/Bakåt". A puzzle piece should appear where you stand. Make sure that you stand in the shadow of the puzzle piece.

Right-click and press "Forward/Framåt" again. You should now collect the puzzle piece. Right-click and press "Back/Bakåt". Another puzzle piece should appear. Repeat 8 times.