The “High School Musical” film franchise just hit its big 20th anniversary … and we’re celebrating with a Guess Who gallery!

Fair warning — this one’s gonna be tough. These pics span years … and they’re all grown up now, so … Good luck, Wildcats!

If you’re still craving more HSM, then get ya head in the game and test your Wildcats knowledge with a little word search!

Honestly, it’s one massive throwback — and we’ve also pulled together all the most iconic scenes to celebrate the franchise that launched Zac Efron, Vanessa Hudgens, and a whole generation of Disney stars.