Guess the Rule is a card game whose goal is to guess the rule that drives the sequence of the cards.
Its inspired to Eleusis card game but its not exactly the same.
You need to sharpen your mind to find the hidden rule.
You may play in standalone mode (you against the system) or in multiplayer mode. In both modes its always the system to choose the hidden rule.
The multiplayer mode is free for 30 days at the end of this period you have to buy to unlock the multiplayer mode.
The single player is always free.