TapGem is a very interesting puzzle app game.† The object is to place 4 gems on each colored region and ensure that each row and column has the correct number of gems as indicated. See the left margin and the row of numbers on the top.
If a number is in black, then you have satisfied the correct number of gems in that row or column. You can then white out the other squares because they cannot have gems.
There are 60 free levels. I’ve done all the easy and medium levels.† Here’s what I don’t like: many of these [Read More...]