Mystery Number Game: Clue by Clue 

Clue by Clue is a free mystery number game that turns number sense into detective work. A number is hiding, and students must find it using clues such as "I am an odd number" or "My tens digit is bigger than my ones digit." Each clue rules out more suspects until only one number is left. Students then name the number, and the fewer clues they open, the more stars they keep.

Every case gives students practice with core math topics:

• Odd and even numbers
• Multiples and times tables, from the 2 times table up to the 9 times table
• Place value: tens digits and ones digits
• Comparing numbers with "more than" and "less than"
• Comparing digits: bigger, smaller, the same, or double
• Adding digits to find a digit sum
• Square numbers and prime numbers (Hard level)

Just as important, the game builds logical reasoning. Students learn to combine several facts, test a guess against each clue, and eliminate numbers step by step. A wrong guess is never wasted, because the game explains which clue the number breaks.

For teachers, Clue by Clue works well as a warm-up, a math center activity, or a quick challenge at the end of a lesson.

Students can also pick a nickname and compete for first place on the leaderboard. No sign-up is needed, and no personal information is collected.