"I-spy" is a popular guessing game for children where one player chooses an object and says "I-spy with my little eye, something that starts with the letter (insert letter here)". The other players then try to guess the object. However, there are other words that can be used in place of "I-spy" to play similar guessing games. For example, some people may say "Spot the object" or "Guess what I'm thinking of". Another popular variant is "20 questions" where one person thinks of an object and the other players ask up to 20 yes or no questions to try and guess what it is. These alternative games can be just as fun and engaging for children, adding variety to their playtime.