This week's WiiWare update sees the final installment of the Art Style game series, Orbient, as well as three other titles for you to have a go at over the Christmas week.

In Orbient you begin as a tiny star and have to use gravitational forces to propel yourself through the cosmos; absorbing other stars to increase your size, or capturing them within your orbit.

Of course there are hazards for you to avoid over the 50 stages, such as asteroids and black holes, so keep your wits about you.

The game costs the same as the previous two Art Style games at 600 Wii Points.

Up at the higher end at 1500 Wii Points is World of Goo - an award-winning puzzle and construction game. The aim of the game is to grab the living, squirming, talking globs of goo and build structures, bridges, cannonballs, Zeppelins, and giant tongues in order to bring the Goo Balls to safety. Play alone or with up to three friends for real construction fun.

If you enjoy Sudoku, you can now play the brain-busting puzzle game on your Wii for 500 Wii Points. With over 100,000,000 Sudoku puzzles, you'll never see the same puzzle twice in Sudoku Challenge.

You can choose the classic nine-by-nine Sudoku gameboards as well as Grand Sudoku, which challenges you to complete five intersecting Sudoku boards simultaneously. There are three difficulty options, so whether you're a beginner or a Sudoku champ you can enjoy this.

Finally, and also at 500 Wii Points, is Niki Rock 'n' Ball - a new interpretation of an arcade classic with a unique gaming mechanism.

You play as Niki travelling through different worlds in an attempt to find all the ZeLeLi pearls and liberate your village from a pack of nasty monsters.

The next Wii Shop Channel update will be on 26 December with more Virtual Console classics, apparently including a "secret" Christmas surprise. We'll keep you updated.