[planede]

The original N game v1.0, released in 2004 [1] had fluid vector animation without stutter on a modest computer at the time. It's a pretty challenging platformer, and any stutter would have killed the gameplay.

Later flash versions regressed in performance and can't run this game without stutter in my experience. A way to play the original game today is to get an old version of "Adobe flash player projector". If you are paranoid, use some OS level sandbox around it.

I did not see an in-browser game since the original N game that matches its low system requirements and smooth gameplay.

[1] https://www.thewayoftheninja.org/n_history.html

BTW, the successor N v2 is also pretty good, and it's not flash-based, AFAIK.