This is a game I like to play with myself to "test" my "psychic powers". It can be played solo or with others: I've played it with friends, family, random strangers, you name it. The goal of the game is to guess the suit of the card on the top of the deck. You can use complex statistical analysis to help, if you like, but the purpose of the game is practice one's clairvoyant abilities. Because why not. You can also play this game with Zener cards, which were designed exactly for this purpose, but I don't have any, so playing cards it is!
instructions
Take a standard 52-card deck, remove the jokers, if present, and shuffle.
Attempt to visualize the suit of the card on the top of the deck. No peeking! State your guess aloud or note it down. If multiple people are playing, have everyone say their predictions before continuing. Ideally, everyone should make their guess before speaking it, so as to avoid influencing the other players.
Turn over the top card. Confirm whether your predictions were or were not accurate. Keep a tally of both correct and incorrect guesses for each player.
Repeat until the deck runs out of cards, or until bored. The player with the highest number of correct predictions wins!
If you're interested, you can compute your accuracy by dividing the number of correct predictions by the overall number of predictions made (you can get this number by adding your correct and incorrect predictions together, if necessary). Multiply the resulting decimal by a hundred to get the percent of predictions you got right. Statistically speaking, the expected average accuracy should be 25% (or 20% if you're using Zener cards), so if you score significantly higher than that, you might be psychic! Or not. I'm not an expert.
If you don't have a deck of cards, or just don't want to bother with them, you can play a version of the game in Javascript that I've created below! I suspect the physical cards would be better for actual clairvoyance, but I haven't tested it. Go ahead and give it a try!