The water is clear, but the solutions need some powerful brain work. A new level pack to the Liquid Measure series to quench the thirst for all physic puzzle lovers out there.

Marty Sears' popular combination of anagrams, block-sliding, hilarious animations, and hair-pulling difficulty has become a quadrilogy with Blocks With Letters On 4. It's as punishing and as hilarious as it's ever been, and this time, the background is green!

If you always enjoyed Smart Code Games' superlatively fluid physics puzzle but felt it was a might tame, this poison pack of 30 additional levels gives you a potent new purpose to your plumbing job. Arrange the pipes, valves, bombs and teleporters then click the start switch to route the glowing green toxic liquid into its respective containers, measuring amounts properly to not waste or spill. With virtually no instructions, the puzzles won't hesitate to tease your brain with byzantine constructions, giving you plenty to scratch your head over for most the afternoon or evening.

Smart Code Games is back with another puzzling brainteaser that will test your plumbing mettle. You can leave the overalls and the wrenches at home, however, because your tools here as you seek to fill up pots with just enough water are everything from magical mathematical multipliers to teleporters to freakin' bombs. Plumbers lead a much more interesting career than we ever imagined!

Flush with the success of its recent movie adaptation, Minesweeper's star had never been higher in the eyes of the world. However, taking to heart the criticism that it's gameplay has been a little "flat" since the Windows 3.1 years, it began to seek a new dimension in its to hook the younger audience. One conference with foreign auteur Vjekoslav Krajacic later, and the result is Minesweeper 3D: Universe. No entry surcharge neccesary.

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!

Choo Choo Puzzles, the new simple idea dragging puzzle from a team led by Piotr Iwanicki, sounds like a cross between a candy bar and a maze you'd find in Highlights for Children... kind of inappropriate for a fun little game with only a tenuously abstract connection to railways. Fortunately, the simple mechanics of Choo Choo Puzzles present a worthy challenge for puzzle-lovers of all ages.

Usually when you hear that a game has a bunch of new levels filled with water, it's a call for trepidation, especially when the liquid appears as brackish as it does here. However the Dark Liquid Level Pack, an add-on to Smart Code Games' popular physics puzzler Liquid Measure 2, is just as refreshing a drink as the original. Not much is new, but, after all, it isn't wise to fix a pipe that isn't broken.

Liquid Measure 2 mixes Pipe Mania, water collection puzzles and simple idea physics into a nice glass of flash gaming fun. The difficulty is perhaps overly easy, but the mechanics are clever and the professional presentation should quench your thirst for a half hour.

The third installment in the block-manipulating, anagram-solving, funny-bone-tickling series, the first installment of which was voted one of the Best Games of 2008 by JIG. After nearly two sad blockless years, Marty Sears is back with all the fiendish brain-teasing action and absurd animations fans have come to expect. And if you're new to BWLO, you'll find this even more of a treat... and even more of a punishment. A punishing treat? Anyway, yay!

Here are 50 more visual puns in a painting, hinting at the titles of 50 "great" movies you may have seen recently. Nice illustrations, relatively easy hints, and a smooth interface make this an light and pleasant diversion.

It may feel like someone's pulling the old switcheroo on you, but don't be fooled. It's The New Switcheroo, a puzzle game based on the Lights Out template, where the object is to turn all the bulbs in a formation to the same color. Over the course of 30 tricky and creative levels, The New Switcheroo adds a handful of twists, both figurative and literal, to that formula. It's more than enough to keep you pondering for an hour or two.

Tyler Glaiel, the programming and musical composition half of the team behind Aether, has released this amazing platform-puzzle game with a unique look and gripping, oppressive atmosphere. Whether you're looking for fresh new gameplay, or you're interested in games with subtle emotional values, Closure is where it's at.

Blocks With Letters On is a game that seamlessly combines language riddles with physical tile puzzles. Each level provides you with an assortment of blocks (with letters on), and you must find a way to position them in the supplied pink spaces so that they spell an English word. This sequel's difficulty picks up at the point where the last game left off. Which was already freakishly difficult. Be warned.

An anagram puzzle game from Martin Sears, presented with the distinct flavor of British educational programming. Don't be fooled by the charming hand-drawn appearance and the curiously twisted vignettes between levels; don't worry if the first few levels seem too basic. This turns into a serious brain-twister.

"Z-Rox" is what happens when a punk music fanatic invents a startlingly pure and original puzzle game concept, but just can't help topping it off with a creamy dollop of vanilla Xtreme-ness. It won't throw you into a mosh pit, but it will test your visualization skills over the course of 100 devilishly simple levels.

I/O is a brain-teaser of a puzzle game along the lines of the fabulous Click Drag Type series that comes with no instructions. Use your skills of discovery, intuition and creative problem solving to figure out what must be done to arrive at a solution.

Tonypa is back with a new puzzle game and this one will surely give your grey matter a work out. In the spirit of Web-based riddle games, Tercessrebmun (or Secret Numbers) is a Flash game in which you must figure out the password for each of the game's 30 levels. Each level presents a series of characters from which you must derive meaning and clues that point to a single numeric answer.

Ouverture Facile is French for "easy opening" and is an online puzzle/riddle game similar to Dumb: The Game and God Tower. Using a combination of flash, images and other media, you must gather clues to find the solution to each level. There are over 90 puzzles to solve, so you'd better get started...

An extraordinarily high-quality online puzzle game that brings in real-life events to give you clues on how to complete the levels. Sponsored by Microsoft and created in conjunction with 42 Entertainment, Vanishing Point is an excellent puzzler that plays as good as it looks.

An online puzzle game in the same vein as God Tower, Dumb: The Game and Not Pr0n. These lateral thinking Web games are the work of one apparently psychotic mind, Mark Lautman. In the first 16 puzzles alone, you'll come across binary code, a crossword puzzle, a word scramble, and a quote from... nevermind, that would give the answer away. What they lack in polish they more than make up in deviousness.

JIG reader Josh recently pointed us to a flash version of the old raft puzzle everyone played back in grade school. The simple idea is that a group of people must cross a river using a small raft. Unfortunately not everyone gets along and there are certain rules that must be followed in order to get everyone across safely.

Do you yearn for a game to challenge your massive intellect? Did you beat My Diamond Baby in a half-hour without cheating? Want something harder? Well, here it is: God Tower. This is the toughest puzzle game I've ever seen. I'm not going to lie to you; it's currently unbeaten. But that shouldn't be a problem for you, right?

An action puzzle Flash game played by using only knight moves from the game of Chess, Troyis is a simple yet challenging casual Web game for people of all ages. The objective is simple: fill all of the white squares of each level by landing on them with the knight.

Toby Godden, of Vibration13.com, has made available two different games that are both worth playing: Virus and Treasure Hunt. Virus is composed of several puzzles that you must solve separately and together to win the game. In other words, the answers you gain from one may be used to solve another. Virus...

Remember those word problems and logic puzzles from school? They probably weren't much fun back then when the fear of failure or a bad grade was hanging over your head. Well now there is a site filled with logic puzzles, complete with handy graphs and tables (made in Flash) that you can use to deduce your answers.

Net is a game about connections. There is a central energy source, and the objective of the game is to connect all devices to the energy source in the fewest moves possible. Of course, if you're like me, I ignore the number of moves and just try to finish a puzzle. Subtitled "The game for the mind", this game definitely falls into the category of a brain teaser.

Lately, I've been wanting to play a game, called Mastermind, that I used to play a lot when I was in high school, but couldn't find a decent version of it anywhere online. The versions I did find were either buggy or weren't much to look at. So I made a better one.