Every algebra riddle here is a story wrapped around an equation. Two moves solve almost all of them:

1. Translate. Let the mystery number be x. Turn each phrase — "double it," "add 3," "the result is" — into symbols.

2. Isolate x. Undo whatever's being done to it, in reverse order, doing the same thing to both sides so the equation stays balanced.

Logic and word riddles work differently — there's no equation to isolate, just careful reading. Use "Show clue" if you get stuck, and "Show solution" walks through the reasoning.

The Daily tab gives everyone the same one riddle per day — solve it to keep your daily streak alive.