Klax ROM

Also, be sure to check out Magical Tetris Challenge.

Klax is a puzzle video game released on Game Boy Color in 1990 by Atari Games and Digital Eclipse. It was designed and animated by Mark Stephen Pierce with the software engineering done by Dave Akers. The object is to catch colored blocks tumbling down a machine and arrange them in colored rows and patterns to make them disappear. 

Klax was originally published as a coin-op follow-up to Tetris, about which Atari Games was in a legal dispute at the time. Controls consist of a four-position joystick and a button. The player controls a small paddle at the lower end of a constantly running conveyor belt. Using the joystick, the player can move the paddle left or right to catch tiles in various colors as they advance down the conveyor.

Below the paddle is a well that can hold up to 25 tiles in five columns of five; pressing the button causes the topmost tile on the paddle to fall directly downward and into the well, as long as that column is not full. The goal is to form “Klaxes”, or unbroken horizontal/vertical/diagonal lines containing three tiles of the same color.

Doing so awards points and causes those tiles to disappear, allowing any tiles above them to fall toward the bottom of the well. Bonus points are awarded for completing multiple Klaxes with a single tile (including lines of four or five matching tiles) and for Klaxes formed by the falling of already-placed tiles.