Enigma is a puzzle remake of Atari’s Oxyd. The goal is to roll your marble around so that it hits the special Oxyd stones (usually they are located along the level’s outer walls, like the black stones in the screenshot below), which then open to reveal a coloured tile. You can open two at a time and have to match each pair together to solve the level. That sounds easy right? The fun part is that each level has tons of traps and puzzles that make it really challenging to get to those Oxyd stones!

Believe it or not, this free game has over 1,000 levels; that should keep us all pretty busy for some time!

Download: http://www.nongnu.org/enigma/index.html . Enigma is available for Windows, Mac OS X, and Linux.

Fish Fillets is a puzzle game having the objective of helping 2 fish to find their way out of each of the 70 level screens. This is done by having them push things out of the way and working together to help each other out.

The fish are secret agents (Mission Impossible-style) and have several cases to solve (you’ll learn about them in the second level via the self-destructing message. With 70 levels, the game should keep you entertained for some time!

Fish Fillets is available for Linux, Windows and Mac!

Time to fire up your neurons and try some brain-stimulating games! Here are 4 to get you started:

1) Simon memory game: Just like the old electronic game; I had one just like this when I was a kid! You can download the Flash game by following this link, right click on the Simon game and do a “Save As…” from the pop-up menu. You need to make sure you have a Flash player installed. You can also play online: http://www.80smusiclyrics.com/games/new4/simon.swf. You can also try another version out at Cyclog Software called Simon32

2) Suduko: From the PortableApps web site. This is a really great version!

3) Sokoban: Here’s an addictive 3D puzzle game that should keep you occupied for some time. You have to push the boxes on to the stars with the ball. Simple concept, hard to do and loads of fun!

4) Puzzle Game Collection by Simon Tatham: This is a great collection of 27 little puzzles. They run on Windows, Unix and Mac.