I had an idea today about a card came to practice Triangle
Congruence. There would be a game board would look something like this:
Students would have three cards in their hand. Then they
would pick up a fourth card, and then discard one card. The first student to
have three cards that make a pair of congruent triangles must show their cards
to the group and tell them which congruence postulate or theorem they used.
This idea can probably be improved upon, for example
adjustments to the number of cards to make the game a little more difficult.
For example in a few trial runs I found that it was not uncommon to finish your
hand in 2 or 3 turns.