From Tame Game:
Trivalon is a brand new puzzle game with simple rules and control. It's a wonderful treatment for boredom!
The game field is a tube, on both sides of which there are elements that can be dropped into it. You can drop only one element on one turn. Then the next element takes place of the dropped one and so on. When there is a sequence of three similar elements in the tube, it disappeares adding points to your score. Elements should be dropped from the side, which is marked with a pointer. After each correctly dropped element the 'active' side is changed, but if you drop an element from the 'passive' side you get a penalty point.enalty points are shown at the barrier between the elements and the tube. If there are nine penalty pints at the same side, this side is blocked for four turns. This means that you cannot drop elements from it. The game is over when the tube is filled up with elements.