Flick Kick Rugby is a variation of Flick Kick Football that was released earlier.
The rules are very simple. You need to kick the ball between the upright goal posts from any distance, any angle, with wind. You get different score depending on the difficulty of the shot, and if you manage to do a streak you get bonus. You have three chances to miss.
You "kick" by flicking up with your finger, which also controls the the strength and angle. Compensating for wind can be tricky.
It does get boring after a while though. Save it for short breaks.