What is Szinekura? It's just Hungarian for "sinecure", which according to the dictionary is "a position requiring little or no work but giving the holder status or financial benefit." It is also a sort of pun, as if you squint hard, it can also mean "lord of the colours". Oh, you meant what this game was? Sorry
The objective of this game is to drag squares of similar colour next to each other.
The lower your Score, the better you're doing (yeah, it's that kind of game), and Delta shows how your score would change if you were to drop the square you're dragging at its current position.
You can start the game by typing in a "board code" and clicking Start. "Board code" is a very official-soounding word for basically anything you like – and the same code will always give you the same board. This also allows you to replay your favourite boards or share particularly tricky ones with your friends. (Which you're unlikely to have if you have favourite boards.)