Cannot remember the full names but A and T go together and C and G go together. So black with Yellow and red with blue. All the colors go in the middle, the outside is white and small brown. Also pay close attention to the pink connectors. It will let you put any piece wherever even if the pink overlaps so be cafeful with that and also make sure there are not pink connector lines missing along the edge. Start with the two ends as there are only certain pieces that will fit in there and go from there - the colors don't have a particular order. Carefully check all the connectors and make sure they are pink; that is really easy to miss. You can also try lifting each piece up to see if any are overlapping.