I saw it listed under top downloaded Free apps and gave it a shot. I guess it's the Flappy-like mechanic, but seriously, it's a yellow ring and a black line, with a grating sound effect every time you tap the screen. Are gamers really this unimaginative now? https://itunes.apple.com/us/app/circle/id911152486?mt=8 p.s. This is not a ploy to get you to link to my game. I just don't get how some games get popular and others don't, especially when some of the former looked like they took a lunch break to develop.