Eleusis Express: a game that quickly turns harder than it should be

   So I'm always on the lookout for new good, challenging games.  Found one a few days ago, thought I'd share.  You can play with only two decks of cards and something to keep score on.  It's called Eleusis Express, and here are the official rules in case you want to try it, but here's my quick summary and a rundown of what just happened:
   One person is the rule-maker, the rest are guessers.  The guessers are supposed to have 12 cards each, but we decided that didn't add anything to the game, and let the guesser pick any card they want to play on this turn out of the deck.  The rule-maker makes up some rule in their head which some playing cards will fit and some won't.  Guesser 1 plays any one card in front of them, and the rule-maker says that it either fits the rule they've concocted, or doesn't.  If it fits the rule, it goes next in a row of cards that have been played that fit this rule, and the person who played it gets a chance to guess what the rule is.  If it doesn't pass the rule, it's placed immediately below the last card in the row of cards that matched the rule, and there's no guessing the rule.
   So we learned pretty darn quick that if you're thinking you want to make up a hard rule, NUH UH, it's too hard.  "The next card in the series must be higher than the difference between the previous two cards in the row" IS WAY TOO HARD.  Over a few days, we learned that if you make a rule seemingly too easy, you'll be surprised at how hard it is to guess.  "If it's a red suit, it must be followed by an even number & vice-versa" = NO.  "Is it an odd number" took us many rounds to get through.  Not that we're dumb, just that you're trying to correlate so many pieces of information about each card.
   And as the rule-maker, it can put you in stitches that they're not seeing this obvious pattern that's RIGHT THERE, right in front of them.  "THEY'RE ALL ODD NUMBERS!  EVERY SINGLE ONE THAT FAILED WAS EVEN!  HOW DID YOU NOT SEE THAT?"  (then you play a game as guesser)  "Oh, um, never mind."
   And just to illustrate that point, I just played a round with my folks.  It went as follows:
4 of spades, matches the rule.

Jack of hearts, doesn't match.

2 of clubs, doesn't match.

7 of hearts, doesn't match.

4 of clubs, matches the rule.

Jack of spades, doesn't match.

King of hearts, doesn't match.

4 of clubs, matches the rule.

Ace of spades, doesn't match.

4 of hearts, matches the rule.

4 of diamonds, matches the rule.

4 of hearts, matches the rule.

4 of spades, matches the rule.

4 of diamonds, matches the rule.

And here's where I died laughing when one of my folks blurted "I just can't figure out the pattern!"  Finally, ""Um, must be a four?"  YES!!!  Holy cow!  That just proves that the human mind looks for more complexity sometimes than is really there...  it's a good game, I recommend it.  Just keep in mind this warning: make the rules way easier than you think they should be...