50% off GameMaker: Studio Professional Upgrades and Exports

Not sure how many people use GameMaker, but this just in:

From the email:

For one week only, YoYo Games is offering a 50% reduction on all upgrades to GameMaker: Studio Professional, and selected Export Modules.

Upgrade from GameMaker: Studio Standard to GameMaker: Studio Professional for only $25.
Upgrade from GameMaker 8.1 to GameMaker: Studio Professional for only $37.50.
50% off when you purchase any or all of the Export Modules (HTML5, iOS, Android, Windows Phone 8 and Ubuntu Linux).
With GameMaker: Studio Professional, you have access to all the features you need to release your game to the world faster than ever before. Simply enter your licence key to our Checkout to receive your discount and go Pro.

Take advantage of GameMaker: Studio’s export modules by targeting some of the biggest platforms to bring your games to the masses. With 50% off, our export modules have never been more accessible. Just enter your GameMaker: Studio Professional licence key to our Checkout to get started.

It is time to take your game development to the next level with GameMaker: Studio.

Sale ends May 25 2014, so take advantage of these offers before they are gone.