What are the rules of the slapping game?

You, of course, know the game, called variously Slapsie, Slapps, Slap, Red Hands, Hot Hands? You know, the game the Ghastly Games collectors describe thus:

A 'back of the classroom' game. Two people put their palms together horizontally, fingertips touching. In turn one person would try to slap their opponents hands before they could move them out of the way. If they missed there opponent would have a go. You could also twitch and try to get your opponent to move their hands before you did. If they did you got a free slap.

Once a persons hands were sufficiently red they were deemed to have lost. Bullies always cheated. Wearing rings was generally not allowed.

The more lethal option was Knuckles.

Alternate rules: Two player game: players hold hands flat in front of each other one with palms up and the other with palms down the person with palms up has their hands underneath the other player this person take five turns trying to slap the other persons hands before they move them then they switch.

[ed: and then again there's this offering:]

Thought you might be interested to know that we played the Free Slap rule in Slapsies gaining a free slap if your opponent flinched three times.

Contributor plays slapsies with the cat but he doesnt understand all the rules.

Yes, the same game for which I, as is my wont, mused upon the potential merriment one could derive from the three-or-more person variations.

Today, it is my vast pleasure to share yet another variation, introduced to the world by Mary,no less,Flanagan: sightless slapsie, the audience game Mary introduced at a recent conference.

Sightless Slapsie only starts in the Slapsie configuration [one player has hands on top, palms-down, the other hands on bottom, facing up]. From there, it becomes more of a hand-clapping game. Both players, with eyes closed, simultaneously change the positions of their hands, flipping their hands from palm-up to palm-down, and vice versa, hoping that somehow they'll be able to find and then clap each other's palms.

No pain. No competition. Just fun.

She informs me that she also envisions her variation played as a mass-multiplayer frolic, similar to my above mentioned three-or-more person variation, only, obviously, more varied.

See, for further example, this: