Kenken Puzzle

The numbers in each heavily outlined set of squares, called cages, must combine (in any order) to produce the target number in the top corner of the cage using the mathematical operation indicated.

Set Game

Try the "SETS" Problem of the Day! The object of the game is to identify the 6 'Sets', of three cards each, from 12 cards laid out on the screen. Each card has a variation of the following four features:

    1.  COLOR: Each card is red, green, or purple.

  1. 2. SYMBOL: Each card contains ovals, squiggles, or diamonds.

  2. 3. NUMBER: Each card has one, two, or three symbols.

    4. SHADING: Each card is solid, open, or striped.

A 'Set' consists of three cards in which each feature is EITHER the same on each card OR is different on each card. That is to say, any feature in the 'Set' of three cards is either common to all three cards or is different on each card.

Sumoku Puzzles

In sumoku puzzles, tiles must be arranged in a crossword-style pattern such that each row and column adds up to a multiple of the key number.  Try these online puzzles!   Note! In sumoku puzzles, colors or numbers cannot repeat within a single row or column.

Sumoku Online

Place the tiles on the board so the add up to a multiple shown on the die.


The power cells have to be placed in the circle so that all the numbers in the same straight line add up to the power line total.

Crazy Counting Machine

Make the number on the crazy counting machine using as few steps as possible.  Use doubling strategies to get close to the number then work toward the target number by adding and subtracting.

Add ‘em Up

Place the tile at the top of the queue in the board so the surrounding tiles add up to that value.  If they add up, the tiles will be removed.  The goal is to clear all the tiles from the board.  You can also make a sum greater than 9 so the number in the ones place is that same as the number at the top of your queue.  Check out the online help for more cool features like hints and power moves!


Fill in the blanks with the differences between the two numbers until all the blanks are filled in.