I use Gotcha as an introduction to a new concept. The information is written in a specific order on the answer key, players just take turns drawing cards, trying to be the first to collect a complete set of the cards in the same order.
For example, players could collect the 3 multiplication family in sequential order. Below is a video of the Gotcha Rules.
Gotcha is used in all three of the Multiplication Sets, plus other games that include sequences to be memorized.
All of the rules that we use at teachwithgames.com are published under the Help Tab on the website.
Proverbs 15:2 "The wise person makes learning a joy...", (NLT)