They mark the cards by clipping it or marking it with a chip. The Letter Factory Letter Sounds. This video is a kindergarten teacher favorite! Get the printable game here: Letter Sounds … It has all of the clips … Letter Sounds Activity Cards. Get the printable game here: Letter Sounds Listening Games. Children listen for beginning sounds in words and use bingo markers to stamp a letter each time they hear the letter sound. Children look at the picture, say the word, and find the letter that matches the beginning sound.