Coober Pedy is the city of opals. And as many people dig for opals there are a lot of shafts all over the area. To prevent people from falling into shafts the Aussies provide a lot of premonitory signs. In this game you are to find all shafts spread on an area of 15x10 fields. Click on a field to get information about the number of shafts surrounding that field. But beware of clicking on shaft fields themselves - otherwise the game will be over. You can explore the area step by step. As soon as you certainly know the position of a shaft you can mark the corresponding field by clicking on that field while the checkbox "set/delete mark" above the board is checked. Wrong marks can be deleted by another click. Uncheck the checkbox again in order to explore further fields. You will win the game as soon as all shafts are marked and all other fields are explored.
 
legend: 
mark this is a mark for a shaft  
all neighbouring fields are free of shafts all neighbouring fields are free of shafts
example:
 one shaft is neighbouring this fieldthere is a shaft on this fieldtwo shafts are neighbouring this field 
 one shaft is neighbouring this fieldthere is a shaft on this field 
 no haft is neighbouring this fieldtwo shafts are neighbouring this fieldthere is a shaft on this field 
one shaft is neighbouring this field ONE shaft is neighbouring this field
two shafts are neighbouring this field TWO shafts are neighbouring this field
... ...
eight shafts are neighbouring this field EIGHT shafts are neighbouring this field, there is NO free field around  
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