I'm trying to find the publisher of a game from the early 1990s called "Torus".
It was a 2d realtime puzzle game on DOS or Windows 3.x. Spinning rings of different colors fell from above onto spikes at the bottom of the screen.
You could manipulate the order of the rings on the spikes. The goal was to match the colors to get some pattern (possibly three in a row) so they would go away and make room for more fallen rings.