This Valentine Secret Message Activity for kids uses a fun color-filtering trick to hide and reveal letters, pictures, and messages. Free printable included!

Valentine’s Day is the perfect time to combine fun, learning, and a little bit of magic! This Valentine Secret Message Activity is a playful, hands-on way for kids to explore letters, words, and pictures—all while having a blast. The activity uses red markers and red Magna-Tiles to reveal hidden messages and images, giving kids a satisfying “aha!” moment as they uncover each surprise. Some pages even include blue letters and designs, which add a pop of color and help kids distinguish letters or pictures during their hunt.

Thank you for visiting. This post may contain affiliate links to recommended products at no extra cost to you. Read our Disclosures and Terms of Use. Don't miss out again, become a Reader here <--it's FREE.

Valentine Secret Message Activity for Kids revealing hidden letters with a red Magna-Tile

The best part? It’s all in a simple printable! Parents don’t have to gather a lot of materials or prepare complicated activities—just print, grab a red marker, and let the kids dive in. Whether your child is coloring over hidden letters, discovering secret words, or searching for hidden pictures, this activity keeps them engaged, learning, and entertained.

My youngest son had so much fun scribbling over the hidden pictures, messages, and letters. Then he went on a mini “treasure hunt” to find each one. When he got to the alphabet page, he especially loved finding the letters in order—a perfect way to sneak in some early literacy skills while still keeping it exciting and playful.

Find more Valentine’s Day Activities here that you and your kids will love!

Valentine Secret Message Activity for Kids decoded Valentine pictures and letters

How the Secret Message Decoder Activity Works

This activity is based on color filtering, the same concept used in classic secret message decoder glasses. When children scribble over the page with a red marker, the hidden letters, pictures, and messages blend into the background and appear “invisible.”

When a red Magna-Tile or colored filter is placed over the page, it blocks the red overlay while allowing the hidden designs in other colors to stand out. This simple science trick turns the printable into a secret message decoder, making learning feel like a fun discovery instead of a worksheet.

Educational Benefits

Valentine Secret Message Activity for Kids color-filtering printable with hidden pictures, letters, and messages

This activity is a playful way to sneak learning into Valentine’s fun:

Problem-Solving: Kids think critically as they search for hidden letters and pictures.
Letter Recognition: Children find letters hidden in the designs, helping reinforce the alphabet.
Reading Skills: The secret messages encourage kids to read and decode words.
Fine Motor Practice: Coloring and using the Magna-Tile strengthen hand-eye coordination.

Replacement Ideas for Red Magna-Tiles

No red Magna-Tiles? No problem! You can use:

Red or colored plastic color paddles (These are designed for kids and comes with a whole rainbow of colors)
A piece of red transparent plastic (This is large enough it could be cut into several pieces)
A piece of plastic that has been colored with red permanent marker (results may vary)

Valentine Secret Message Activity for Kids

Directions

🎥 Before you start, watch the quick video below — prep to play in under a minute.

Color to Hide: Kids use a red marker to scribble over the images, letters, or messages. You can also do this before hand. The red layer hides the content, creating a mini mystery to uncover.

Search with a Magna-Tile or Red Filter: After coloring, kids use a red Magna-Tile or red viewer of your choosing to reveal the hidden letters and pictures, adding a hands-on, interactive component.

Tips to Make It Even More Fun

Turn it into a scavenger hunt: Cut out the hearts with the secret messages and hide them around the room for kids to find.
Read together: Encourage your child to read each secret message aloud.
Alphabet challenge: For older kids, cut out the hearts and have kids find the letters and arrange them alphabetically.

Valentine Secret Message Heart Activity for Kids – Color, Reveal & Find | Free Printable