It seems simple enough - figure out how to place all the dominos on the right on the board on the left, matching up the numbers on the board with the numbers on the dominos.
But there's more to it than that, because there is only one way to get them all to fit - so each and every dominos location has to be carefully deduced. Get one of them wrong and you won't be able to solve the puzzle.
300 puzzles, in three different difficulty groups
Hours and hours of puzzle goodness
Full undo support
Freely resizable window
Mac OS X 10.3 or later, Mac OS X 10.4.4 or later recommended.