You have to move pieces to swap them with their neighbors up, left, right or down. If you achieve to put 3 equal pieces in a row (in a vertical or horizontal way) then you obtain points and the pieces are upgraded to 1 of higher level. For example 3 copper nuggets are transformed in 1 silver nugget. Check table below.
If you put 4 pieces together the remaining turns counter isn't decreased. In the same way, putting 5 or more pieces together will increase the turns counter.
These are the points obtained:
If you want to make suggestions or obtain the source code you can go to Github site and create a issue, fork the code to send us modifications or fixes or whatever.
In the same way we will be pleased receiving donations:
Thanks! and Enjoy!