This week in the DSiWare store: AiRace and Chronos Twins

We hope you've got DSi points saved up - there are some big releases in the DSiWare store this week.

QubicGames releases its sky-racer AiRace, while Chronos Twin implements a dual gameplay system in a unique action platforming adventure.

First up is Brain Drain, a scrambled puzzle game. Given elements of a model, your task is to place them together accordingly to match up with the original model.

There are a few different effects that come into play to slow you down, and three game modes - Challenge, Race and Random - are available to keep the fun fresh.

Brain Drain can be yours for 500 DSi Points.

Originally a Nintendo DS retail title, Chronos Twins is now available to download for DSi. Players control two characters simultaneously - one of the top screen, the other on the bottom.

Over 19 packed levels, each character can overcome obstacles with a little help from his friend. If one hero is stood on a platform, the other can float in space.

Prepare for lots of difficult platforming puzzles. Chronos Twins is now in the DSi store for 500 Points.

Or soar through the air and race for the finish line in AiRace.

Nine planes are at your disposal, with six locations to bomb around. There are plane upgrades to collect and power-ups to change the tide of a race.

AiRace is available from the DSi store for 500 Points.

Fire Panic challenges you with putting out continuous fires around town. Drawing a route with your stylus, the fire engine will put out any fires it passes on the way.

How many fires can you put out before the city burns down? 200 DSi Points will provide you with an answer.

Finally, Sudoku Challenge brings over 100 million (count 'em!) Sudoku puzzles to DSi.

Along with the classic sukodu puzzler, there is Grand Sudoku mode, which challenges you to complete five intersecting Sudoku boards simultaneously.