I found this really cool putting training aid and it is blast to play in my living room especially with snow on the ground.
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The goal is to hit the ball up the ramp and it will return it 17 in. That means you have perfect speed. But if you have perfect alignment combined with perfect speed it will fall in the little pressure putt hole halfway up the ramp.
It is darn near impossible to do, addictive, frustrating, fun. I've only hit the perfect putt 4 times from 4 - 6'.
$25. The short video is from the inventor who also owns a design firm in Britain.