If anything, make sure you download Slydris.
It seems like every publisher and developer has some sort of holiday sale. Next up, it's Radiangames, the same company behind the outstanding puzzle game, Slydris. Turns out, all of its games are available for just $0.99 through the end of 2012. If you're into retro-inspired creations, break out the wallet and check out these must play titles.