Spell a simple three letter word with plastic letters on the floor.
Then do some sort of activity associated with the word.
You could also try
HAT - put on lots of hats
PEN - go get a pen
JOG - jog around the room
HOP - hop on one foot
BUN - pretend to be a hotdog bun and get eaten
When the three letter words are mastered the game can progress into more difficult words such as JUMP, SKIP and PLANT. It can keep progressing to add silent E and then still more difficult words.