- In this game, the rectangular shape 'U' represents the Universal Set of members for all possible sets.

- If set P is a circular region inside U, then the set 'not P' is the region outside circle P and inside U.

The set 'not P' refers to all members of set U that are not members of set P.

- When selecting members from two sets, the word 'and' refers to the overlapping region P and Q.

P and Q is called the intersection set.

If set P is completely inside set Q, then P is called a subset of Q resulting in (P and Q) = P.

If set Q is completely inside set P, then Q is called a subset of P resulting in (P and Q) = Q.

If set P and set Q do not overlap ,

then they are disjoint sets with the result (P and Q) = empty = Null set.

- When selecting members from two sets, the word 'or' refers to the entire region including P or Q.

P or Q is called the union set. [The 'exclusive or' concept is not used in this game.]

If set P is completely inside set Q, then P is a subset of Q resulting in (P or Q) = Q.

If set Q is completely inside set P, then Q is a subset of P resulting in (P or Q) = P.

- Your Score Report appears after you have made 8 choices.

- Your Game Score is reduced by the number of parrot hits.

- To slow the game speed repeat tap/click on the word

- To increase the game speed repeat tap/click on the word Math.

- Speed can also be adjusted with a keyboard's - and + keys.

- Refresh/Reload the web page to restart the game.

- Adjust the sound level of media on your device.

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