To play red letter, pick one girl to be it. She stands at one of the room with her back to the rest. The other girls stand at the far side of the room. It will call out letters. If the letter is in a girls name she can take a step forward. If the letter appears in her name more then once, she can take one step for each time it appears. The first girl to reach it, becomes the new it.
Variation: hand out cards to the girls with new words they must match instead of their name. For example: animals, colours, months of the year etc. This will let you match the game to a theme.