Klax is the Retro Game of the Day for 27 April, 2016

From Wikipedia:

Klax is a 1989 computer puzzle game designed by Dave Akers and Mark Stephen Pierce. The object is to line up colored blocks into rows of similar colors to make them disappear, to which the object of Columns is similar. Atari Games originally released it as a coin-op follow up to Tetris, about which they were tangled in a legal dispute at the time.

A wonderful puzzle arcade game based on color matching that is absolutely minimalist yet addictive to play.  There wasn’t a whole lot of puzzle games in the arcade, but Atari did this one right.