Elkian - Yeah, I would prefer a background that wasn't animated...but try the cheapest one "Pixel Drops". That one bothers me the least.====Thingfromthevoid - That's why I use arrow keys, x, and spacebar. The current row is highlighted and if you know you're making 6 marks, you just count 6 key presses. Used the mouse on easy puzzles, but dropped it after I got to the big ones.
You can mute by clicking the far left of the box on the options menu...or by clicking the top middle/right boxes during a paused (p) game.
You can skip the tutorial by clicking the button that says "Skip".
Azreal - Just click the puzzle you want to play. Click "Skip" at the top of the tutorial when you start it if you don't want to do the whole thing. Xcecil - The tutorial explains everything. It's way too long if you have any common sense, which is why there's a helpful way to skip it.
x - mark/unmark empty tile, spacebar - mark filled tile, arrow keys - move ...turn off jumping in the options menu.(Mouse may seem easier at first, but you'll need keyboard with harder games)