First, rather than moving individual birds themselves around, you're moving them by row or column, depending on which direction you move after you click and hold. Matches are made when three birds -- sorry, "burds" -- of the same color are brought together, but they don't necessarily need to be in a row or column; they can just as easily be grouped two over one, or one over two to make the match.

Removing all burds from the board not only advances you to the next board, but also gives "Burdaloons", the game's currency. These can be spent to buy special items that are used to achieve various effects.

For example, the Paint Can removes all burds of the same color, just as the Balloon clears a column, and the Leaf Blower clears a row. Keep in mind that clearing burds doesn't mean matching them; it means removing them from the board to bring other burds to fill in. So if you're not seeing the matches you want, clear them out with an item. This becomes more important during different game modes.

Other special items include the Burd Seed, which shuffles burds on the board, and Quota, which fills the quota instantly. More on this in a second, but know that you need to use Burdaloons to purchase an item, which lets you use the item once for free, then makes you buy each subsequent use.

Burdaloo doesn't just want you to keep removing burds ad infinitum; it throws different game modes at you. One of these is Burd Landing, where you are presented with three burd silhouettes on the left hand side of the UI. Your goal is to fill in these silhouettes by matching the appropriate burd a number of times. You must fill in all three to move on to the next board.

Another mode is Burd To Order, where you are presented with a succession of burd silhouettes and must match each particular type as they come in order to progress. So it's for these modes that the Quota was designed.

Another element that comes into play is Herman. Herman is a grey, crotchety burd who refuses to move, so you can't shift the column or row that he's in. There is a stoplight indicator that appears when he's around that's meant to tell you when it's possible to move him. It's either yellow, which is unmoveable Herman, or green, which means you can get rid of him by clearing burds beneath him and shifting him upwards to eventually be cleared.

There are also Achievements to be had for completing various in-game results, which just means that any day now, the Achievements concept will have jumped the shark completely. Until then, enjoy Burdaloo.