You can download Suomitetris DS with source code here:

Suomitetris DS 1.1

A wish for a donation:

Although Suomitetris DS and rest of my programs are free, making them have required a lot of time so it would be nice to receive a little compensation for making them. Donations will also encourage me to keep releasing my programs and games for free. I don't expect any large donations. Even small donations are more than welcome. To donate, click the PayPal donate button on the top of this page.