Jack Slap is a reaction time game where you compete against your friends to slap the picture of Jack as soon as he pops up.
To begin, both players must hold down their ready button, and once the picture appears, they race to Slap Jack! The fastest person wins. If you false start by lifting your finger off of the ready button before Jack appears then you lose one point.
You can think of Jack slap as being just like the card game "Slap Jack" except that every picture is Jack.
If you would like to practice alone, then flip the single player switch to hone your reflexes and improve your average.