Frozenbyte’s unique co-op puzzle platformer Trine has been offered up by Impulse for 50% off through this weekend. This brings the price down to a very agreeable $10.

The fantasy action game has players creating and using physics based-objects to solve puzzles and defeat enemies, offering three completely different characters to use at any available time.

Trine is out now for both PC and PS3, with the Impulse sale going through the end of January 31. Check out our review of the title here and our interview with developer Frozenbyte here.

Though the game doesn’t release until next Tuesday, Nimblebit’s indie kart racer Zero Gear has released an update that can be downloaded by those who pre-ordered and have access to the beta.

If you’re unaware, those who buy the game before its release on January 12 get a 25% discount off the total price along with early access to the vehicle combat racing game. If you do have the beta set-up on Steam the update will begin when you restart the client. Full change log after the break.

Sakari Indie has announced that its cartoon-style third-person shooter Foreign Legion: Buckets of Blood has been given the Steamworks treatment, adding 18 new achievements to the title.

In the title you assume the role of a last-standing Legionnaire taking on an entire rebel army. Toting a small campaign with various objectives, such as defending civilians, escorting a tourist bus and a ‘mass-chicken-murder’ map. The game also includes a ranking system that allows you to unlock new outfits, accessories and of course new weapons.

Oh I forgot to mention the best part, the game has been given the Steam holiday sale treatment as well, big time. The typically $7 title is available for only $1.40 through January 3.

Nimbly Games’ aerial combat title Altitude has landed on Steam, and what’s better $5 cheaper than expected, at least for a limited time. The action indie is getting a 33% discount from its originally announced price of $15 through December 11 via the digital distribution leader.

The multiplayer heavy game boasts several modes that bring what the developer describes as a deep and rewarding experience hidden in an old-school arcade game. Just looking at it reminds me of Rocket Riot, which certainly lived up to its name. The games may or may not have similar gameplay, but certainly RR brought that deep multiplayer experience Nimbly Games claims Altitude provides.

Altitude is available on Steam now for slightly under $10.

Today’s Midweek Madness sale on Steam has been revealed as ACE Team’s original action brawler Zeno Clash has been slashed by 66% off the standard price. Set in a punk fantasy world, Clash presents itself to be a first-person fighter emphasizing brutal combat in close quarters.

The game saw a full release back in April of this year and has already received plenty of recognition boasting itself as an IGF Finalist and winning the ModDB Editor’s Choice Award for Best Upcoming Indie Game in 2008. The dev has announced that an ultimate edition of the game will see an Xbox Live Arcade release in March 2010 as well.

Zeno Clash runs $15 standard, but can be picked up for a dime over $5 through Thursday, December 3.

Direct2Drive is doing a ‘twitter exclusive’ sale on Runic Games’ excellent action RPG Torchlight, taking 25% off the game through tomorrow, November 22. Just enter the code 5OFFTORCH at checkout and you’ll get, you guessed it, $5 off Torch.

The gameplay really takes the Diablo style to another level, and with the title you get the TorchED editor which lets you customize practically everything you see. It’s a real great game, well worth the standard $20–let alone only $15.

If you need further convincing, check out Geoff’s review.

Steam has dished out this week’s Mid-Week Madness deal, offering up Dejobaan Games base jumper Aaaaa! A Reckless Disregard for Gravity for 50% off. It bests the 30% off sale Impulse ran recently, so if you were on the fence then, now seems to be an opportune time to jump.

The title has the player diving off skyscrapers simply for the fun of it and to impress the judges that will determine your score based on style, the stunts you pull on the way down, and whether you stick the landing, or stick all over the pavement.

Aaaaa! can be picked up for only $7.50 now through Thursday, November 19. Check out our review on the title.

Positech Games has announced the release of their space strategy title Gratuitous Space Battles, an RTS/Tower Defense hybrid game that offers colorful, sprawling battles with hundreds of ships at the player’s command. The gameplay starts in the design stage of this ships, from there you position your fleet and give out the pre-battle orders, then you sit back and watch like a proud papa.

GSB has been in beta for a couple of months and now the full release can be picked up now from the dev’s website, a demo is available to try as well.

Interestingly, while the game’s not yet available on Impulse, the $3 off pre-order deal still is, and probably will be until the digital distributor updates the title’s status sometime later today.

DiezelPower has released a new update for their arena-based zombie shooter Nation Red, now available on Steam. The patch brings the new strategic gameplay mode along with new weapons, player perks,  Steam achievements, leaderboards, and more.

To celebrate the new content release, Nation Red has been given a 30% discount putting the game at $7; an extremely good price for the fully loaded, often updated game.

Though no actual end date for the sale has been mentioned, similar sales in the past usually run around a week which would give you until Monday, November 9. A demo for Nation Red is available for download here.

Dejobaan Games’ base jumping free-faller Aaaaa! A Reckless Disregard for Gravity has been given a 30% discount off the standard price through this weekend on Impulse.

The title has the player diving off skyscrapers like a diving board in the Olympics and as you fall judges determine your score based on style, the stunts you pull on the way down, and of course whether you stick the landing in one piece or several thousand pieces.

A Reckless Disregard for Gravity is available through Sunday, November 1 for just $9.99.