There's nothing quite so boring as memorizing words when learning (or maintaining the ability to communicate in) another language. I've tried keeping up on my German speaking skills, but I needed a little extra to keep me on the ball. It's not a full-on game or anything quite so awesome as that, but it was fun to make and fun to use and includes some of my favorite characters. The 'arrow' by the Amanita mushroom takes me to the next set of words.
... waiting on 2015 and Samorost 3.