The idea's not brand new, but the implementation is fun - this is a newish UWP game (via MyAppFree) for your Windows phone or tablet/hybrid that lets you draw, freehand, on a 2D puzzle to direct the path of water towards a waiting glass. It works surprisingly well and is a nice diversion to while away transit delays and the like....

From the Store description:

The glass is sad because it's empty. Your job is to draw a line to make the glass filled up with liquid and smile again!

Try to find the best way to complete each level. You can come up with your own solution so be creative and don't be affraid to think out of the box!

Some levels might look easy but let's see if you can actually get the 3 stars.

features :

• Dynamic mechanism. Draw lines freely to complete levels!
• Simple, smart and fun puzzles but can be challenging too
• Lots of levels with more coming soon!
• Fun and relaxing theme that will make you stay for quite some time

Here's Happy Glass UWP in action:

You can grab this for free here in the Store. It's ad-supported, but there are no mechanisms to remove the ads, so you have to live with them!