At the starting coordinates you find the entrance of Finlandia Hall. Opinions vary, but generally it's considered a masterpiece of the Finnish architecture.
From here proceed around the corner to next stage and count the vertical bars protecting the window at N 60° 10.575′ E 24° 55.957′. Let their number be A.
Go to
N 60°(8 + 0,18247*A)'
E 24°(54 + 0,15187*A)'
Here used to be a place which had some resemblance to a Hitchcock movie (The Birds). Actually a small pier with bird reliefs. Seekers had to count the number of birds. Those days are gone, pier removed and joggers taken over the area from bird-feeders. Now you need to count the number of round stand-alone poles, which joggers use as "steppers". Their number is B.
Now go to
N 60°(9 + 0,11375*B)'
E 24°(55 + 0,05331*B)'
Here you'll find an exercise site.
C= Number of separate gym equipments (separate means not touching any other piece of equipment)
D= Number of round metallic bars in the northernmost equipment
E= Number of round metallic bars in the southernmost equipment
The cache is hidden at
N 60°xx,ppp'
E 24°yy,qqq'
where xx=3*C-1, ppp=(B*D*E)-9*C, yy=14*C-1, qqq=999-10*E
Cache is a normal lunch box. It shouldn't be too difficult to find, but watch where you put your hand. The box is a ½ litre Tupperware.
Actually this cache should be called Töölönlahti 2. The first cache in the area was Töölönlahti Bay, Helsinki As far as I know, it was also the first time when geocaching got substancial publicity in a major newspaper in Finland.