Trine 2 Director's Cut is currently on sale in the Wii U eShop, meaning the $19.99 co-op puzzle platformer is now on sale for $14.99 in the US. That price will last through February 28 in North America and all the way to March 7 in the EU.
And if that sale and the ongoing Steam for Linux price drops aren't enough for you (FTL for $5!), GOG.com is also having a sale this weekend, on a number of impressive role-playing games. You can grab The Witcher 2 for $9.99, Divinity 2: Developer's Cut for $9.99, or pick up the original Torchlight for $7.49. Steam is also offering the sequel to that last one for just a few bucks more.