Loyal Blog Follower William Hu steered me to Sequence Nine. I think I saw the icon on the App Store and assumed it was a Flow clone. It's nothing like it. In fact, it's unique, challenging, sophisticated and most importantly, fun.
There are 240 levels and things get tough.
1. You can't pass through the red walls.
2. Passing through a white dot will open/close the white lines.
3. Wormholes: Many levels have two sets of wormholes.
4. The hardest levels include white lines (with white dots) also yellow lines (with yellow dots) and wormholes.
I thoroughly enjoyed the first 3 batches or 180 levels.