The city of Söderköping is the last link of the Blue Ribbon of Sweden (Sveriges Blå Band) also known as 'Göta Kanal'. The canal goes from Gothenburg in the west - up to Trollhättan by the lake Vänern - up to Motala by the lake Vättern - and down to Söderköping by the fjord Slätbaken in the east. Right across the entire country. That is, as I've been corrected, if you round of too many decimals. If you look a little closer you will find that Göta Kanal ends in Mem, some 10 km east of Söderköping. Yet another reason to call this a Fussk Slussk. :)
On the trip you will have to pass over a hundred water locks (slussar). The pun in the name of this cache is; 1. The misspelling of 'Fusk' (cheating) to the likeness of the word 'Sluss' (water lock); 2. And the other way around to make a rhyme. The word 'Slusk' incidentally means 'shabby-looking fellow'.
At the greeting sign to the city they have built a fake water lock (fusk sluss) and this place is the place for the cache.
The cache is a blue plastic box (12x22x4 cm) with a transparent lid.