Free
No download
Works on phones
Puzzle Games
Educational Games

About the game

Numbers in a row, one of them replaced by a question mark. Figure out the rule linking them and choose the number that belongs there. Four answers look believable, so a lucky guess rarely works.

Level Mode keeps serving new puzzles with rising difficulty, and you can use a hint or skip a level that has you stuck. Daily Challenge hands you 10 puzzles, tracks your time against your own average, and shows how your speed compares with players around the world.

How to play

Study the number sequence, work out the rule, and pick the answer that replaces the question mark.
On a computer, click an option with the mouse or press 1, 2, 3 or 4. Press Esc to close menus.
On a phone or tablet, tap one of the four answer buttons.
Stuck in Level Mode? Use a hint or skip the level.