Plumber Connect: Hexa Puzzle comes from Le Oanh. I've done enough plumbing puzzles in the past. But this is the first one that has hexagonal cells. Unless I'm forgetting another one, which is quite possible.
There are 150 levels with triangle tiles, 150 with square tiles and 150 with hexagonal tiles. Even the 'Hard' levels are easy.
There is another 'pipe' puzzle game that I've been doing. I'll report on it within the next 2 weeks.