Situation: From Schaffhausen towards Singen.
A bit befor ethe border a road leads to the left (if you are coming from Germany
a bit after the border). After some metres you will see the signs for the parking
fro the Kesslerloch. Follow the signs downhill to the grotto.
Climate: Walk-through grotto, situated
on a sunny slope at an altitude of 400 m, often windy. Stays dry during rainfall,
but after heavy rain it can seep a quite long time.
Rock: Limestone, grotto
Topo: 
swiss Bloc °1 (GEBRO Verlag),
more
info and order
Boulder problems
About 19 problems and traverses 5a - 8b+
up to 5+ : 2
6a - 6c+ : 3
7a - 7c+ : 9
8a - 8b+ : 4
Others: 1
Bout du profond, Fb 7c