Blindfold Chess meets FIFO3 Tic Tac Toe in this mental model party game.
It doesn't matter whether X or O wins; as long as you keep track of the board in your mind, you can never lose.
MemFIT can be played by any number of players.
The initial player makes the first move (symbol "*" provides a valid random move) and the game continues with the next player's turn.
On each turn, the current player chooses if X or O won in the previous move (symbol "X" or "O" with a crown, respectively) or if the board is simply ready for the next move (symbol "+").
If it was not the right choice, that player loses and the game is over.
Otherwise, it was the right choice, the same player makes the next move (possibly using symbol "*") and play proceeds with the next player's turn as the new current player.
Sounds easy? Try it on PrequelPlay.
Note that, FIFO3 Tic Tac Toe is like Tic-Tac-Toe, but with shrinking pieces.
When a fourth piece of a kind enters the board, the oldest one disappears.
There are always at most 3 pieces of a kind on the board.
Why isn't MemFIT based on a different game?
Well, it could, but it would probably not be called MemFIT (Memory FIFO3 Tic Tac Toe) :-)
Besides, Blindfold Chess is too complex for us common mortals.
A simpler game is needed to make the concept work and everybody seems to know Tic-Tac-Toe.
FIFO3 Tic Tac Toe has the nice additional property that it can be played indefinitely (even if the second player cannot prevent a skilled first player from winning in 3 to 6 moves).
As it is, MemFIT hits a sweet spot in terms of familiarity and simplicity to be played in casual groups and thus more people can get better at creating mental models while having fun.
Enjoy!