Who could ever be satisfied just upgrading weapons systems and defensive towers? In Upgrade Complete, a shooter from Tony of Shift fame, you can upgrade practically anything you can think of. The title logo, the menu screen background, the user interface buttons... and oh yes, your weapons systems, too. How fast can you upgrade everything?

Shift 4 is now available to play and it brings with it a shiny new iPhone app of the original Shift experience to take with you on-the-go. If you're familiar with the Shift series so far, a lot of the elements in this game will seem very familiar. However, twists do come, as you will eventually find yourself having to control more than one silhouetted fellow. You've now got to use a team of folks to reach the exits and advance.

A pack of cuddly woodland creatures suddenly find themselves homeless at the hands of Big Brother and his menacing chainsaw. To escape to Paradise Meadows, they need to collect a golden acorn from each level (obviously). Regrettably, some of the adorable animals must be sacrificed along the way...

If you've played the original, or the even better update to that one, then you probably will be thrilled to know that Tony has just released a third game in this fantastic series that takes the concept of negative space and turns it upside-down. Shift 3 extends the familiar jump and run, puzzle-platformer formula by adding a few surprises.

The original Shift was an interesting platform game that used negative space as an entertaining hook, but it came with a few problems that ultimately made it feel unfinished and experimental. Now, Tony of Armor Games has released Shift 2, which is basically the game the first one should have been. It's not enough of a leap forward to warrant the "2" in its name, really, but it refines and expands upon the original concepts to deliver a smoother, more drinkable dose of run/jump/puzzle distraction.

Shift embraces the same negative-space-centric platforming concept as Yin Yang, but in a style more elegant, more minimalist, and more pulsating with sexy-sweet spy music. With a press of the Shift key, you are flipped beneath the floor on which you are standing, and reverses both your body color and gravity. It's a unique platformer with a twist, and it's a good deal of fun.