Pro is a custom mode for Piano Tiles. Classic, Zen, and Rush modes have this. The difference between Pro and 50 is that there are no continuous streams of tiles; they are all detached Pro modes actually allow to get better scores than non-pro modes, for human reflex reasons. Another reason is the fact that continuous straits of tiles may cause some plays to recklessly mash their screen rapidly, causing them to hit white tiles when the stream ends.
Tiles type Edit
On Classic, Zen, and Rush modes, the tiles are spread out on the board rather than in a continuous line. On Classic mode, there are 50 tiles as well.