You just won an amazing prize, but it’s locked in a safe! Thankfully, the code is a single integer between -40 and 40, and you’ve got the clues to solve it.

Set your sleuth-in-training on the case with this hidden-message activity.

Put your detective-in-training on the case with this secret-message activity.

Crack the code in this printable phonics worksheet all about words ending in -ng and -nd.

What can run but can't walk? Reveal the answer to this clever riddle by cracking the number code in this Riddles and Codes worksheet.

What's both fun and challenging? These Riddles and Codes worksheets, which pack a one-two punch of brain teasers.

What has teeth but no mouth? Find out the answer to this and more riddles in this Riddles and Codes worksheet.

Learners will use the alphabet key to unlock the words written in the heart in this playful Valentine's Day puzzle.

Have fun with grammar and decode these scrambled adjectives, all starting with the letter A! This is a great way to work vocabulary and spelling skills.

Children will follow the clues to solve a math riddle in this fun number-sense worksheet.

Is it just me, or is this worksheet upside down? Have some April Fools' Day fun unlocking this jester's secret message.