Peggle is a pretty rare breed of casual game. It's a game that is casual down to its core. The game can be played by closing your eyes, moving the mouse and hitting a button, and that method might end up being perfectly successful. However, surround that simple gameplay core is just a beautifully arranged package. The graphics, the design, the music, the extras. It all comes together in Peggle-and Peggle Nights just refines the formula even further.
Peggle is essentially pachinko, or for those of you that know The Price is Right, it's like Plinko. You fire a ball from the top of the screen and it bounces down among an arrangement of pegs, each peg your ball connects with gets lit up and earns you points. Struck pegs disappear at the end of each turn. The goal in each level is to hit all of the available orange pegs before you run out of balls to fire at them.
The gameplay is made more interesting with a wide variety of bonus points for making various types of shots (hitting a distant peg, bank shots, landing a ball in the moving well at the bottom of the screen, and bunches more), inventive and tricky level layouts, and powers bestowed by the various Peggle masters that host each section of the game.