Balltris

Balltris is a puzzle game published by DRH services Inc in 1994. It was released for DOS platforms with a direct control interface. The arcade game features a top-down perspective with fixed and flip-screen visuals. The game incorporates tile-matching puzzles, and falling block puzzle gameplay.
Balltris is unlike classic square falling blocks that disappear when three or more same-colored blocks form a line. Instead, the Tetris type game features a cup being filled with balls of different colors.
The different colored balls fall randomly from the top of the screen. The player can move the balls by moving them to the right or left and flipping. A chain forms when a group of same-colored balls touches each other from at least one point. When a chain of a minimum of three balls is created, the balls disappear.
The keys 4 and 6 on the keyboard move the balls left and right whereas, numeric key 5 rotates the balls. The players can use three effects in each game using the F1 key. Space bar drops the balls, F2 produces toggle sound, and F3 displays the next piece. Furthermore, Esc pauses the game, and F9 aborts it.
You can quit the game using the F10 key. The player can view all the keys by hitting the ‘?’ key. When the balls drop, the player has to rotate them and position them in such a manner to form a chain or match of at least three same-colored balls. The player has to prevent the cup from filling by eliminating the balls by making chains.

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