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The Gameplay

Cardagain is a simple puzzler, but one that gets inexplicably harder as you go.

Four cards appear on the table, each with one of two symbols.
You have to remember where each one is, and then they're all flipped over.
Two cards are flipped back, one of each pair, and you then have to flip over the other two in the same order.

As the game progresses, the cards are shuffled around, and more cards are added, leading to a tougher game, as you try to memorise mountains of info all together.