This DS update of the classic formula is brilliant, especially for it's budget price. Rather than (as on classic consoles with dpad and buttons) moving a reticule and swapping the two highlighted pieces, you can freely drag a piece along and entire row, making for fast gameplay!
Basically coloured blocks rise from the bottom of the screen (you hold the DS a la Brain training), and you move blocks by dragging them horizontally to match 3 or more of the same colour. Simple in premise but addictive, great for journeys and breaks with puzzle modes, wireless single card play, play over Wifi, and time attack battles. Plenty of game for your money, an essential DS purchase.