If you're itching for more Portal action, but can't wait for Valve to figure out how to count to 3, then look no further than Portal Stories: Mel. A community-made mod, this short, yet sweet storyline takes place before the events of Portal 2.

The puzzles are tricky, sometimes frustratingly so. Don't hop into this right after finishing Portal 2 expecting to breeze through it (especially not Advanced Mode). The storyline is decent, as is the voice-acting - not amazing, but good enough to get you across the finish line. The best part? It's free!

100%: You'll have to explore some tucked-away nooks and crannies to find all the hidden secrets, but nothing too difficult.