Found 1 rating (with comment) on this game

Niagara may be the best "Trap hole" pinball game ever made.

The Pros:
An incredibly balanced game that is deceptively well thought out and put together. The 4 trap holes are all inline and the pop lanes on either side of the center alley are where you will find lots of points. Brilliant artwork on the PF and on the BG means that whether you are playing this game or not, you will always have something to do when this game is in the room. Trapping your first 4 balls into the column of holes means that your entire game has to be planned out and executed before the first plunge even takes place. Light your pops and your specials for big scores and replays!

The Cons:
Getting the ball back up to the top of the PF is no easy task. I hope that your mechs and rubbers are nice and fresh. This design requires it. Find one if you can. VFWpinball.com

The Takeaway:
A game with really good action when properly maintained and cared for. The subtleties of this table are not to be denied.

Update:
Getting the 1-6 bumpers unlit (IN SEQUENCE) is really hard. Getting all center ball holes trapped is easier. But not by much. I had a number of games where the ball landed in the bottom hole and I had to get the ball ALL the way to the top to try to get it to drop into the center lane again. Then the ball drops into the top hole. Getting the second and third balls into their respective ball holes requires some skillful nudging. This game is deceptively good. I love it!