That idea makes me think of the fact that we only use 10% of our brains, if that. We are all probably capable of developing photgraphic memories if we took the time.
With spelling it's important to remember that students need to read / see the words several times before you can expect them to be able to spell them. Here is a game that may be used for reading and speaking, or reading and writing practise.
Include the words you want your pupils to be able to spell in your sentences or questions.
Give your students a task to complete while you prepare the board, unless you have an electronic board. Using the target structure and vocabulary write up a series of jumbled questions under letter A with jumbled answers under letter B. For example:
you how old are? years am seven old I
name your is what? Shelley name my is
Tell your pupils to form pairs and for one to be A and the other B. On the word "go" the As work out their question and the Bs work out their answer. A then asks B the question and B answers. When a pair has finished your list they stand up. Wait until a few pairs are standing and then hear some of the answers.
You don't have to use a question and answer format, but can use only questions, or only sentences. The sentences can be repetitive if you are drilling a certain structure, and you can throw in a few sentences, which revise what you have been teaching in recent weeks.
If your class will not perform pair work exercises correctly, but just talk all the time, or you are not sure what they are doing because there are so many of them, then use this game for fun reading and writing practise. Give a time limit for the task so everyone who finishes in the given time wins. If possible allow the pupils who struggle the most to sit next to the best students and allow copying so students may learn from each other!
For more fun game ideas to use with all group and class sizes please see:
Teaching English Games