Jewel Tower is a "tetris-like" game for your Windows Phone (here's our spotlight on the game) that was first released about a month ago as a free, ad-support game. Well that's changed.
XIMAD is still offering Jewel Tower for free but has dropped the ads. The ads-free version is fully functional and just as entertaining as the original, ad-supported version. You now just have a little more screen space to view the game with.
If you're looking for a simple, yet challenging, game for your Windows Phone you can find Jewel Tower here at the Windows Phone Marketplace.