Flappy Angry Birds: Classic Game

Flappy Angry Birds: Classic Game is one of the Puzzle games here that asks for no download and no sign-up. Designed around touch input, and comfortable on a small screen. Listed under bird, cartoon, casual, clicker, hypercasual.

It is drawn for a tall screen, so it fills a phone held upright rather than a wide monitor. It costs nothing and asks for nothing: no registration, no download, no launcher.