Who knew that the Four Color Theorem would make for such a nice simple idea puzzle game? OneFifth's Flood Fill is a fun and colorful way to fill up a coffee break, even if its 20 levels are over way too quickly. But hey, the background music is catchy.

When one wakes up in a featureless white room, apparently at the whims of a malevolent steam-punk computer, the first instinct is to escape. But... why? What's your argument? Can you justify your actions? Such is the question posed by ir/rational Redux, a puzzle adventure game by Tom Jubert, of Penumbra story-telling fame. Propositional logic has never felt so intense!

The gophers are coming, the gophers are coming! In this vibrant, kid-friendly tower defense game designed to dust off the ol' graphing skills, you defend a carrot from waves of hungry gophers, who need to be fed until they burst into rainbows. Plot points on the graph to reveal your enemy's marching path, dig up valuable rubies, and place upgradeable towers to keep your carrot safe from the waves of starving critters.

Have you ever wondered how to combine a puzzle you love, like sudoku, with something you've always feared, like gym class? Maybe not gym class, but how about math class? Conceptis Puzzles' CalcuDoku Light is the latest edition in their Conceptis Light series, and this puzzle pack features plenty of mathematical mayhem to keep you occupied.

Created by Japanese math teacher Tetsuya Miyamoto in 2004, Kashikoku naru Puzzle translates literally as "A Puzzle That Makes You Smart". Hitting that exact right combination of mathematical calculation and logical reasoning, it soon became an international sensation under the name KenKen. As the story goes, "Ken" translates as Cleverness, so KenKen (or, I guess Ken^2) is Cleverness-Squared. That's an apt description for this arithmetic grid-based brainteaser. At JayIsGames, we're always on the lookout for good online versions of pen-and-paper games, and Nextoy has provided with 6 daily, devious, and easily-printable KenKen. Why? Because they Ken Ken Ken!

Inspiring equal parts hate and admiration, Defuse consists of a series of increasingly difficult math and logic puzzles that can be solved using the mouse. What happens if you fail? Well, hey, the important thing is that you can retry without penalty. But if you can complete the puzzle in each room and make it to the finale, you will receive the ultimate reward... possibly.

Atomic Cicada brings us another original puzzle game, with a light math flavor, and an atmosphere somewhere between "excessively subdued and calming" and "horror film waiting to happen". Whether the game is trying to imply an ominous black cloud puzzle OF DOOM! or just a strange twisting of "relax" spelled backwards is completely up to you.

Finally, a game that allows you cheer that most cherished of subjects: math. With a shiny new facelift, exploding tiles, and the ability to rotate the board 90 degrees, Drop Lift v2.0 is a major upgrade to the original. Link together chains of numbers that add up to nine in this awesome block-dropping puzzler.

A gorgeous puzzle game with an impeccable user interface, Minim sets the standard for browser-based casual games. Minimize molecules to nothingness by combining atoms with digits on them, according to a few simple rules. Despite the references to chemistry and some light math, Minim isn't an educational game. It's more like a comforting hug followed by a knuckle sandwich.

Zerosum is an intense variation on match-3 puzzles, with strict policies on winning and losing but vast opportunities for strategy. Easy to learn, hard to master. Make matches by adding adjacent numbers together, but make sure you don't run out of digits to replace them! It's brain candy, once you get into it, like defusing a bomb constructed by an six-year-old arch-villain.

DropSum is an elegant puzzle game by Nick Harper, who describes it as a cross between Tetris and Sudoku. Burst bubbles and form complicated chain reactions by forming groups that add up to 9. If you ever find yourself yearning to lay down some damage with the power of sums, this is as good as it gets.

Play as a row in a database where your objective is to fight the other rows to decrease their numbers and increase your own. It's a numbers game, pure and simple, and by not pretending to be anything else, mySQLgame has managed to take the ubiquitous browser-based MMO and distill it down to the very essence of the genre.

dRive is quite possibly the first calculus-themed game to get a review on this site, but don't go fleeing for the high country quite yet; you don't need to understand the math to play the game. At its core, dRive is a simple "catch the falling objects" game, but the unusual, calculus-based method of controlling three games at once turns dRive into an innovative, fascinating game.

File this one under brain training games: Math Mountain is an addictive arithmetic game wherein you climb a mountain, competing against another person or the computer, by answering math questions correctly. If you're not very good at arithmetic, Math Mountain is a fun way to practice; if you're already good, then why not give your brain some exercise?

Which side are you: right-brain or left-brain dominant? While right-brain dominant people use their intuition and emotions to guide their decisions, left-brain dominant folks are more sequential and time-oriented in their approach. Perhaps you are middle-brain dominant, meaning that you vacillate between the two hemispheres when making decisions. If unsure,...