Assault minigames (aka Spamfinger! for mobile)

[GeneticsLuke]

If you find that you tap things faster via use of your non dominant one than your normal writing hand, secure the tablet or smartphone with your dominant hand and spam the living crud out of the hit detection areas blinking at you in friendly bright colors as they light up using the fingers of that opposite hand. It takes awhile to get a nice rhythm going but once you get in the zone, there are way less accidental missing a strike/hit s than just randomly pewpew-ing! <- unless you are bored and want to further randomize it. Have fun!

[Zavier]

Or place the device down and use both hands!